OK I just found a trick that would've worked even before, and indeed has allowed me most of those previously-bugged Godot games (only the ones that don't need GLES3-specific stuff, I guess): I type "cmd" in the game's address bar, then in the console I type (in this case) "20SM.exe --video-driver GLES2" That's it LMAO *facepalm*
I also forgot to compliment your usage of blackbird song as background noise.