The game has some glitches that I noticed... the big white creature that dashes a lot can get stuck infinitely in one place, for example. It also seems very easy to accidentally dash when you just want to do something like jump; that killed me more than anything in the final boss fight. The story and atmosphere are nice, though.
There are some problematic glitches I noticed, one not to bad, the other very annoying: first, if you jump on the top of the screen's edge (at the highest part of a level), you will become stuck inside the wall and have to exit the level. The more annoying problem happens if you are put against a wall by one of the big red boss-like enemies in the last few levels; no matter what you do, you're trapped, and pretty much guaranteed to die. Unless there's a big secret I missed, Level 4's Star is impossible to get, but everyone's already mentioned that. If this had a few more upgrades and maybe abilities, it would also be awesomer.
This is a fantastic game. I finally managed to get all of the Badges and 100% this challenging physics platformer, the music and the design are both great, and I hope there's some sort of sequel, eventually... 5/5