This had my favorite interpretation and execution of the theme of any game I've played so far. The concept is classic and brilliantly done. One thing I would suggest is to make it so you can jump on your old selves. It would make sense since they are physical enough to push the buttons anyway. It would also open up new puzzle possibilities. Occasionally I would die and the game would simply hang, requiring a page refresh. That's the only thing I noticed that felt off though. This was an excellent submission, thank you!