Really neat puzzle game! I got stuck on Level 8 and ended up giving up after struggling for like 10 minutes. I tried to use the level skip shortcut (shift+space+p) but it didn't seem to work. I'm wondering if you've disabled that. I would've like to attempt some extra levels to give you some more feedback.
I'll start by saying that I personally don't play puzzle games so take my feedback with a grain of salt. Overall I found the basic mechanic incredibly clever and you've clearly shown it's unique enough to design a whole game around.
The first few levels did a great job of helping me understand how to use the mechanic and I felt like they had a great ramp up in difficulty. If I were a more puzzle-minded player maybe I wouldn't get stuck on Level 8 but that's where it felt like a bit of a wall for me.
I really enjoyed both the music and the visuals. Overall this is a really solid entry and I hope you get some puzzle-enjoying playtesters for more relevant feedback!