Very nice visuals and use of the theme!

The game lags when particles are first summoned. I had the same problem, and it's an easy fix! All you need to do is use CPUParticles2D when the game is being played on web (you can check that with OS.get_name(), as far as I remember). And you can tell the game to use GPU/CPU particles depending on the platform.

:D

also, i like your videos and your games…