Dude, I really enjoyed it! To prove it, I tried a few times to do a 'speed run' and managed to finish in 3:38. By no means flawless, with a death thrown in there, but not a terrible run either!
There was some times though that the game felt quite unfair, in particular after getting the double jump, there was a crazy spike in difficulty. The jumps immediately after that powerup were so dang close, with probably only a few frames to nail the jumps. Otherwise an awesome game!