This entire game was an amazing experience from start to finish.
The art is fantastic and the level themes pop out, giving each area a certain feel to it. The level design never makes you second-guess the game, only your skills and what you're applying in the situation. The enemies are fair, but still a bit tricky at times (though the clairvoyancy helps that quite a bit) which keeps you on your toes. Every time I died, I felt like it was my own fault for not managing my phase and keeping track of the enemies, it was never because of the game.
The only times I ever thought I couldn't progress were caused by me not realizing I could do something, like the melee giving a boost upwards if used in mid-air or something else like that.
Two things I think might be bugs, but I'm not sure. In the very bottom area with three flies and boiling water where you need to boost to the left to climb the tall room, if VSync is turned off it is significantly harder to get the speed booster to activate. (This might have just been me though.) The other is that if you spin dodge while running up a wall, it practically resets the timer and lets you double your distance, which I'm not sure is a bug or feature.
Other than those two things that might not even be the game's fault, this was perfect, and I'm very happy I got my hands on this game.