Very creative idea, I liked that a lot! Unfortunately, the gameplay itself was not too enjoyable for me. I think it's mainly because it would take me a few more levels to really get a hang of a newly introduced mechanic, so I found it quite difficult to unlock a new mechanic every level. Also, I felt like the locking (middle mouse / backspace) was a bit unintuitive, or I didn't really understand the timing on this.
But overall, I loved the visuals and the idea a lot, it's really charming! :)