Hello! Took a moment to feature your game in this big ol' Halloween video of mine. Your game begins at 12:39
Mostly, I just find the process of having to look for five keys to get downstairs a little forced. I get that it is to make the player fully explore, but perhaps something else could be done to lead them around before taking them down there?
Eithe way, still absolutely worth a play, and a title I enjoyed!