With a few tweaks to the ghosts and maybe a slightly more maze-like map, you could have a quite fun short horror game; currently, however, it feels more like an interactive art piece that isn’t inherently bad, unless you wanted it to be a horror game. The most significant change necessary is giving the ghosts some form of ai that allows them to follow the player, maybe have that AI only kick in after you acquire the mask. This provides the player with a chance to take in the scenery and map before suddenly being snapped back into the reality of the situation. Not a bad game, just a strange one.
Gameplay below includes a few other possible changes.