Also am curious what this is made in.
Oh no that's unfortunate. it's made in Godot and I know it struggles with the webgl export quite a bit.
Do you see any error in the console?
For some reason the game works when the screen is smaller but it suffers from severe lag between updates for things like reviving the dead.
I don't think it's you, I think the webgl export is just very unstable. I've replace it with a windows build for now