I like the minimalistic art style and the idea. It fits together well. I was a little frustrated when I fell at the end of the second level and had to start over. Personally, it is just too long.
I don't know if it is intended or not but you can trigger buttons twice to change their state again. This was kinda confusing when the white character stood in front of the button and you did not see if it was pressed or not. I trapped it multiple times and it was always "still red". Also, I am missing footsteps and ambient sound.
I think the idea has a lot of potential and I will try it again at some point to finish it. good work.