Fun little game!
I would just suggest toning down the screen shake, for people like me who get motion sickness from pretty much anything it gets annoying very quickly :-)
One more thing, I had the game window too small on the itch.io page as well. I solved it by unselecting the Fullscreen button in Frame options (Unity WebGL has its own full-screen button that takes over when you unselect this). I would also change the Viewport dimensions to 960x650 which then makes the game window fit exactly the itch.io page (not sure why the itch.io default value is so small).