really nice idea and art! i think it is a little hard. even in a level where i had nothing but pits to fear i would have failed at least once. here are some changes that would make that an excellent game:
- a few introductory levels
- some sound (espcially an additional warning, when the buttons change)
- maybe a visual timer like a line going around the buttons to better indicate when they switch
overall i am a big fan though!