Wow, I love these mechanics! Recording and then waiting for your past self to do an action is hella creative! Art is cute, and the music slaps, great job!
I was just missing some basic sounds from this game. Whenever you stepped on a button, whenever a door opened, jump sounds could be a bit more noticeable etc.
Also, whenever I play a game that only uses the keyboard such as this - I also expect to be able to fully navigate the menu using the keyboard controls, and it's not what happens here: Whenever I finish a stage, I have to go from the keyboard and reach my mouse to aim and click at the button and then get back at the keyboard. This back and forth action can get a little bit annoying, but with keyboard navigation this could easily be fixed. Just press a key and it goes to the next level, much much better.
Overall, keep up the good work!