I liked the concept of the game! Especially since the button will be used in different mechanics. The presentation could be bit better, and I got softlocked/stuck few times and had to reset the level via menu.
Also your game contains Quit Game button but it is a browser version that don't need one? Pressing that just makes the game stuck.
Overall good entry, I played it through. I liked how the final levels started to "build upon" the previous levels.