Pretty cool game! It is, in my experience, pretty difficult to get physics engines to behave properly. I think your game does a pretty good job at not relying on super-precise interactions, although I'm sure there's places it could be improved.
I did notice a glitch where sometimes I would accidentally click on the side of a block--I think while still in the block menu--and my mouse cursor would get stuck in the resizing state, and I would have to restart.
The game makes very good use of the theme. A rhythm based physics puzzler is a pretty neat idea.
Sadly I was not able to beat level 16. It seems very complicated! 🤯