So this may not be a bug but the menu music starts from the beginning every time you transfer from options to title screen or back. It would be much nicer for the experience if music would be playing in the background non-stop while you haven't started the game yet (looping menu music).
There was also a problem with the menu screen that pops up below other UI element in game (Interact window) so player may not see "Resume Game" text and it can't be interacted at this point.
If you press ESC while playing and press options and come back - game has restarted.
The door archways are a bit too tiny. I think it would be better if the upper wall (higher in y-axis) collider was higher to also make transferring through door visually logical to the eye.
I hope these help. The game itself has great potential.