Really good idea and aesthetic! I love this concept and how it's executed. But I have some personal feedback that would make it better for me.
The first room took me a while to get, I had to check the gifs to understand how I had to use the mechanic. Also, sometimes I got confused because the replay and your sprite look the same so when they mix you sometimes lock track of you are. I would love to have an easier first level and some differentiation between the character you control and the replay. But other than that I've really enjoyed this game!