Hi, we are glad you like it.
We know the web version right now has some performance issues, we already optimized a lot but it's not enough, I think it's due to the poor compatibility of Godot with WebGL, we will try to improve it as best as we can, but the game should be played from Desktop.
The version here on Itch it's just a showcase, we will release a Demo on Steam also.
The bug you mentioned (the enemies not taking damage) is due to the collision happening between 2 physics frame and it's a consequence of the low fps, we can't do much except trying to optimize the web version further.
Thank you anyway for the feedback!