Gameplay was solid, and cool aesthetic, would have liked some bg music though. I feel like I got pretty lucky with some of the later puzzles, and the timing mechanic puzzle solving was intersting, but not in itself challenging without more of a penalty. This is especially true of the time two at once puzzle that doesn't lock you out. Because you aren't locked out, there's no reason to try to actually time both of them at once, rather you can just choose one or the other at random and time that one and see what happens.
Some way of acknowleding or enforcing a more structured approach would be nice to emphasize the puzzle aspect. Tracking the number of button presses for instance. Or having a limit or par score for each puzzle. Something like that.
Loved the art style. And you really made the limitation the core of the gameplay, so well done there.