Nice execution! I think it would be even better with some audio, especially since that’s one of the jam’s judging criteria as well.
One small tip: in Unity, you can go to Edit → Project Settings → Player, and under Resolution and Presentation, set the WebGL Template to Minimal. That way, when you upload it to itch.io, you won’t have that rather ugly bar at the bottom with the Unity logo, game name, and fullscreen button.
You can enable the fullscreen option separately in the game settings on itch.io afterwards.