This game is a rage game, as many others have said, but what many others haven't said is some of the rage comes from some very poor coding when it comes to movement - specifically turning back and forth and jumping. If you haven't completed all animation sequences down to the pixel, you are NOT allowed to jump or turn. That means you can't let go of the left button and immediately hold down right and expect to turn. You won't. In fact, if you immediately press right after holding left, the game may sometimes glitch and keep making you walk left.
Same thing with jumping. If your character is, for any reason, in the middle of standard movement - you will NOT be able to jump. Yes, that does mean that if you are being pushed forward by an enemy, you CANNOT JUMP. In certain situations this very much seems to be a bug. Now, I admit, I'm not the best player, but 1 to 2 out of every 5 deaths feels like I was cheated.
This is a cute game, though, and if you are able to drop a gamepad and walk away from a cheated death, then you can deal with this game.