Changes:
-New ship! and new guns! Means more buttons, though.
-Variable speed setting (3-state)
-Shields that recharge slowly
-Enemies now fire bullets directly at you! (Surprisingly complicated to get working)
-Faster transitions
-More than four colours (edit: now also reflected in the name :V )

Upcoming stuff:
-More enemies, and different graphics to the old ones! (already drawn, just need to add into game)
-Big enemies!
-An actual level/"campaign", with saner difficulty ramp-up (Not likely to happen soon)
-Changing the score to a timer instead in "survival mode" (currently the only mode)

Current known issues:
-Make asteroids not spawn the shrapnel when hit by powershot, as they all die immediately anyway in most cases (edit: changed a few things, so should work better now)
-Powershot's muzzle flash not erasing enemy shots yet... not sure why (edit: derped a little detail... now works)
-Forward shot not terribly useful at this point, compared to split shot
-Score font doesn't have transparency
-Powershot temporarily screws up both regular shots if you tap the button while holding down fire (edit: fixed)