A bunch of the puzzles were cheatable it seems. I was able to jump up high enough to reach the platform without the use of a box where it seemed the use of a box was intended.
The blocks that go transparent were never obviously transparent. I would mistake one for transparent sometimes or mistake a transparent one for opaque.
The music worked very well as background music. I saw what you were going for on some of the puzzles though and I thought they looked interesting.
Overall a nice entry.
Edit:
The game worked fine on my Windows 11 PC.