really liked how the game changes over time - his face, the colors, etc. all really great. also liked the menu music, would definitely suggest music in the game as it'd really boost the atmosphere, especially since you did such an awesome job building it with the visuals.
like said before, changing his movement might make it a little easier. it was pretty tough at some points. having someone test the levels might help too!
thank you for sharing this with us :)