Thanks a lot for the feedback, i'm glad you enjoyed the game. Btw the game HAS sounds for pickup and taking damage, but they're both bugged right now for some reason, they work fine on my editor, but they don't seem to work in the HTML version.
i like your idea of adding fog and some particles, i originally wanted to do that too, but i'm unfamiliar with shaders and particles on godot and i ran out of time.