Fake doors make weird sounds, soooo if you didn't hear any weird sounds from the door, then:
A: you were probably just accidentaly colliding with a ghost
or
B: godot is sucking at porting the game to html
edit: just went through the game and yes, the doors do make sounds. So if you couldn't hear any sounds, then that must be a bug within godot, or you had your volume on low.