So I been doing tons of thinking of a game with good balance of game play and wanting to win said game instead of just feeding yourself to the enemies constantly.
With said game balance I came up with the difficulty alone will let you get ate without even trying too hard as you dark souls struggle to win engagments.

Basically the main character you play is an alien species that has blu's abilites to reform. Although the "egg" is their brain inside their skull.
When eaten It forms a protective gooey shell (in the shape of egg) around their brain which allows it to pass through the predators digestive system.
With a tracker installed so their rescue team can pick up the egg and put into a rapid reform tank. If you lose to predator this is basically how you respawn.
However some predators can digest you completely which means bye,bye progress. (have to load last save basically)
Either start a new character that can find your remains (as in loot drop of where last character was eaten) or reload the save depending on the difficulty.
Number of lost research staff is tracked on ship with counter and a crew log of who became lunch and how they did.
Example: Tim was eaten and digested by a small snake (Anal insertion).

Story and game logic:
The aliens you play as arrived at this predator infested planet call "Earth" to study it.
Earth being a highly restricted alien nature preserve, it is illegal for visiting aliens to bring lethal weapons.
You are part of a research team to scan and upload data on the various species that are considered a threat.
Your objective is to find and study predators from a safe distance and gather threat level data with being detected.
You can't use lethal force to prevent becoming prey even in a life or death situation.
Do to the ability to reform you kind of don't have that right to take a life in self defense since in most cases you come back.

You do have equipment to stun or tranquilize predators if necessary however to prevent accidental death by overdose or electric shock
you are required to preform a bio scan to calculate the right dosage for your "weapons". The equipment has a microchip and any unregistered creatures can not be fired upon.

Gameplay (overworld):
You travel right on 2D sidescroller, simple world with trees, bushes, etc.
If a creature is ahead you must hide in the bushes and stay out of sight.
There is chance to meet people for trading, hiring mercenary/assistant, and missions.
When a predator gets close to your hiding spot you can scan it.
However you have to play a QTE mini game to not get discovered.
Some predators require masking scent or bait to keep them distracted.
Once spotted you go into combat, a turn based RPG with a turn timer.

Gameplay (combat):
either 1vs1 or 1 vs 2 (you can have teammate if hired)
Predator and you are on a turn timer, when it's full you take a turn.
Each action has a "time penalty" until your next turn.
Faster a predator is the quicker they can do actions against you.
On your early turns you have to do a bio scan first before any stuns are enabled.
It takes time, the good news is it runs even when it's not your turn. (as long as you do that action that is)
The bad new is it takes a lot of time giving the predator the change to pounce you.
Also when it's your turn while scanning you either select "keep scanning" Or you pause the scan to do something else.
Each turn the predator gets, they first have to drain your energy shield and will power before being able to grab and do something to you.
Your energy shield makes it so they can't get a hold of you and repels their attacks normal last only 2-3 attempts.
Your will power is basically your ability to break free from a grab. It resets after each time your eaten.
The less will power you have the harder the quick time event mini game is.
If you fail you get ate otherwise if you hit zero will power the game is rigged and you lose automatically.
Objective of battle is complete scan and then load your tranquilizer gun or use the taser then knock out the predator. (both need scan to do so)
Taser only buys time before they can take another turn, but the bio scan only need to be 25% to unlock. (limited battery count and needs to be reloaded after each shot)
Once hit with the tranquilizer gun it takes time for them to fall asleep, once they do combat ends.
Predators lower willpower with taunts, teases, and grinding on you (if sex stuff enabled)

Gameplay (eaten):
If you run out of shield and will power (or lose QTE with low will power) you can get grabbed and eaten.
You have to play a struggle mini game to charge a escape meter. Once full an escape direction pops up.
You could be sent deeper or the obvious way out could fail and they just force you back down.
Each predator has routes to take through them to get out, with various degrees of escape chance based on their ability to keep you in.
Certain "exits" may require a quick time event as well or they may be able to block escape a certain amount of times.
The longer your inside the more damage you take (as air runs out or body works to digest faster, you decide why.)
Every moment inside drains your heath, if it hits zero your too weak to escape and get digested. Game over.

Combat Scan balance:
Obviously if you scan a predator once you won't have to do it again right? wrong.
To combat making it too easy to win after having data on a predator you have to DOWNLOAD THE DATA from the mothership each time.
Which can be just as slow as doing another scan yourself. You'll have to upgrade your transmitter to get faster data.
However your gun can hold the data of the last scanned predator so if you get 2 of the same predator back to back then your safe.
There is still small delay to fire weapon as it must make sure your target matches the data of the safe stun parameters.
However if you stay hidden near predator you can pre-scan it, however at 50% your gun beeps to tell you it's almost ready which blows your cover.
Scanning creatures outside battle is for research only and is not a self defense weapon bio scan. You can either do research or weapon scan when hiding near them.
Best case to win is to do bio scan first then gun scan, just hope you don't fail mini game and get caught before you do.

Win condition reward and reasoning to win battle:
You need travel permits to explore further and find new predators. Those cost credits.
Also you can capture the sleeping specimen and bring to ship to do lewd studies or tame them (for getting teammate).
Basically can force/willing feed them, do mating or toy play (consent only),
or let lose on ship to let predator take out the crew. (leads to intergalactic fines) but hey basically paid vore to watch!
Also you have to own a capture device to capture a sleeping predator.

Currency system (cash vs credits):
Your research contract grants you credits after engaging and neutralizing a threat.
Other way to get credits is to get research scans of plants and animals.
Last way to score credits it to trade it with some of that Earth currency.
You can not trade credits to get more cash. Get cash from doing quests or loot from sleeping predators.
You can spend credits on anything from consumable items like medkit, gear upgrades, license to explore new areas.
Earth money is good for buying things found on earth only, normally special items like potions, scent cover, bait, information on
good locations to find research, hire an assistant/guide or recruit a guard to protect you.

Difficulty Modes:
Easy: Start with 3 shield batteries. Weapon Bio scan is much faster. Easier to stay hidden (less QTE). Items are cheaper. Respawn with your stuff, no need to run back and get it.
Normal: Start with 1 shield battery. Weapon Bio scan is normal speed. Normal willpower and hp pool. Item cost normal price. Items must be recovered from where you where ate.
Hard: Start with no shield battery. Weapon Bio scan takes longer than normal. Items cost more. Some items lost when recovered from where you where ate.
Fatal: Start with no shield battery. Weapon Bio scanner is damaged and needs to be fixed somehow. Very slow scans until it's repaired. Items are pricey. Respawn cost 250 credits.
At -1000 credits you get fired from your job and are sent home, game over. Predators more likely to perma vore you and prevent reformation.

Developer notes:
So basically forced delay on players actions before they can safely take out a threat giving time for threat to tease and eat you all up.
You want to try and win engagements to progress your travel license to go further and find new predators to hunt or be hunted by.
Basically no harm to those poor predators trying to make a meal out of you! It's only fair because you can reform right? RIGHT? (can disable fatal or perma vore endings)
Some chance of game overs of being absorbed completely, as the predator has way to keep you forever or digest your reform egg.
Maybe some customization of character (mainly colors and armor if I do)
Mating/Predator fucks you is a feature that can be turned on and off for your save file if you want vore only.
You can marry/become mates with your teammate, you can also tame or experiment with predators on your spaceship.
Overall I'm most happy with the design and can use what I know from my first rpg attempt in flash to make this happen.