I did an Inktober, but only scanned the stuff now. Sapient alien species sorted by name, mostly having appeared in the written episodes (including the not-uploaded fourth).

Judicator: The only know species so far that has both telepathic as well as telekinetic abilities. They are uncommon and regarded as scary, choosing to work predominantly in law enforcement, which earned them their name; they don't use an own name for their species. Judicators communicate exclusively by telepathy and are unusual in being able to communicate with nearly every species, since most telepaths are only able to do so with their own. Some are also capable of altering and inserting memories. The front contains ten retractable limbs. So far there were no appearances.
Kshimit: Native to the Fenjerra-Fenjatis binary system, which is featured in Episode 1.
Leyrr: One of the two intelligent species of Leyrr-Rhat, the planet Episode 4 takes place on. Curiously, both species are aquatics, but due to the Leyrr living in freshwater and the other in the sea, they are unable to interact without aid. Leyrr communicate with electric pulses, which unlike the Doburens' colour changes are fairly easy to translate. They are seldomly-seen on their home planet due to requiring mobile aquariums to leave their rivers. One is seen on the top of a mountain with a space harbour, having a Molurian as his aid.
Limarian: A rather flamboyant, widespread species that communicates emotions with a set of colourful head plates. Males and females differ by the males having tufts on their ankles. Featured in Episode 1 (a bartender) and 4 (a policeman).
Molurian: They are big, have thick-leathery skin, move slowly and don't talk much. It led to the assumption of Molurians being dimwitted, but they just prefer to think in silence and efficiently communicate with the fewest words possible. Their first contact was with the Tolemos, leading to a rather colourful history between the two. Accordingly, most of them live in the Tolemut quadrant close to their allied species' bases. Featured in Episode 1 (2 employees of a private security company) and 4 (the mentioned aid of a Leyrr).