The pixel art in the intro looked nice. I got a bug in the second section where I couldn't move left or right. I could still jump though, and when I did, the floating platform knocked me through the wall and I just kept falling. I restarted and didn't have that issue again, but felt it was worth mentioning. It was also very laggy in one browser, so I tried opening it in a different one and it ran much better. It was still a bit framey at times though. Completely understandable given the timeframe (and the fact that you created your own engine). I love the time manipulation mechanics. Having my past self doing something to help my present self was really cool. Nice work overall!