That was cool! The art is proficient, and the character design is quite charming. The soundtrack is nice and creepy. The mechanics are competent and fun to use. Despite the awful crash-on-death error, I persisted to the end!
There's another strange bug. Sometimes, when flying into something as the bat, the player will become stuck at a half-block interval. This makes most interactions awkward, but it also makes certain interactions, such as pulling levers and standing on boxes, impossible.
All-in-all, great work!
(P.S. You should probably look into what Godot engine feature is prompting firewall permissions. It's quite off-putting!)