Running this game here is unplayably slow for me, so I tried downloading it instead, but then it has this "blank screen with audio" problem which often happens on Godot games for me. I understand the cause to be a clash between Godot and Nvidia, possibly also involving Intel in some way.
Regardless, I recently had the devs of "20 Small Mazes" and "dflop" solve this for me by switching their games to GLES2, which I had read would work if the game didn't require GLES3-specific stuff, then I found that I could do it myself by typing "cmd" in the game's address bar in the explorer, then in the console type "[game].exe --video-driver GLES2"
However, this trick does not work with your game. Perhaps that means it requires GLES3-specific stuff, but then how can it run online? Anyways, with all this in mind, knowing it might well not work, I'd still like to try a GLES2 build of this game, if you feel like it :)