I'm really happy you liked it!
It was me and my friend's first game ever, we put the music minutes before submitting haha, we definitely would've put sound effects. And yeah, I struggled thinking about how to implement the rewind mechanic, but when we had it we tried to make puzzles that worked around it. Even if some of them were quite simple and didn't use much of it, but we tried our best.
I'll actually try to update it once the jam is over. It was really fun making it, and I already have some ideas that can be implemented, starting with making more levels and implementing some other mechanics. Thanks for playing!