Pretty fun game, aside that it makes relatively little sense to use a knife to open a lock (the character should hint it).
Can the mask be used for anything? Is there only one ending?
I did not see the hint because I only clicked on the doorlock once.
That is one flaw in the game that adventure games usually don't have you needing clicking on things multiple times for something useful to happen with it. Except talking to characters now that I think about it, but even then its better to just exhaust dialog options than that.
But I'm looking forward to a more expanded version of the game.