Pretty cool concept! Definitely could see myself trying to minmax the amount of time I take on each level, maximizing my coins, and making it easy to kill my past selves. The audio was pretty good, liked the anime jump sound and its variants, and the shaders are super nice.
Something that would've been nice while I was still learning the game was a checkpoint system or something to save progress going into a run. I made some silly mistakes admittedly but having to keep repeating the first level because I slip up didn't let me see the loop concept shine for a while.