'keep going this is cool' things: Skeletal animation, smooth controls, music loops nicely
Minor tweaks: Polishing (particle effects, landing sound effects), less aggressive sounds (the breathing is a nice touch but it feels very loud and in your face)
Game design: The best strategy is pretty much to stay still so having a hazard go to the player's position would mean they have to move more. Something that the player should try to catch would also be a good addition so they have to move around. An increase in speed/amount of hazards would make the game harder as it goes along because right now it feels the same difficulty no matter where you are in the game