Nice mechanics. Good use of the theme. With so little time during a game jam, puzzle difficulty is always hit or miss. Getting that balance of difficulty just right takes time. So it's a really great that you implemented a level select.
Some of the puzzles with low difficulty were frustrating, since the completion takes so long, Level 4 for example, requires quite some loops of the character slowly moving. That can get frustrating really fast.
Small tip, when using Unity WebGL, you should turn off Itch.io's version off full screen, as they don't play nice with Unity's implementation for full screen.