The sprites and animations are really nice and clean.  The movement controls are smooth, but I think the level design could be made just a little easier.  Some of the really small platforms make the game difficult when they pretty much all have spikes and there is barely enough space to land on as you jump around, just a little bit more space, or a few less spikes would make the difference in my opinion.

I absolutely love your sprite animations, they look super nice! I thought the sensitivity of the key presses was a little too much, but I suck at platformers so I believe it's my fault here. Great game!!!