Great idea but performance kills it.
I have a MacBook Pro with M3 Max (almost the highest Apple laptop configuration) and this WEB version of the game was sadly too laggy, like unplayable for me. I wasn't able to finish the tutorial due to the horrible lagging. In a normal game I was fine until the first effect appeared, then it was unplayable again. I hope it was just an issue on my side. Tried Chrome, tried Safari.
The controls were not optimized for a browser. The "press ESCAPE to continue" kept getting me out of the full-screen, I had to use the ESC again and go back to full-screen.
EDIT:
Tested again the Windows native version on a virtual Windows on my MacBook and it was without issues. So yeah, the web version was somehow broken.
Really cool game! Nice graphics, great idea, very challenging.