I played the frist three levels, then the game wouldn't let me retry the level after I missed the first jump, so I refreshed and the game won't run properly: my character is glitching under the platform when I do the first jump. So I don't know the game further the third level, but it was a really good idea and the game is really nice to play when it doesn't bug.
EDIT: Actually I ctrl+F5 and the bug disappear, but other bugs appeared, like the object activated twice, or the enemy texture was gone but not its collision box after a retry of the level. So I finished the game. Pretty buggy, but your really good level design serves a good game design idea. You achieved to make a really enjoyable game with only one button. The theme is really respected and the game is fun, I'd love to play more of your game !