I like the look of the game, and it has potential to be a good game. But I think a compass would help players out, because it feels like we're wandering around a lot of empty rooms trying to find whatever items we need. I don't know if the crates generate randomly, but I feel like I'd explore a room, find nothing, get turned around, and suddenly find an item I'd need AFTER already being in the room. I would also sometimes have runs where the monster would spawn RIGHT in front of me, and I'd lose a life before I even got out of the starting room.

Cool monster but I fell out of the map 

There are the bones for a decent game here. I think that it needs a lot more direction. Perhaps showing on the map where the exits and crates are, and then building the level as a puzzle around that, rather than having the player wander aimlessly for a while, hoping to find what they need. I couldn't find my way out of the first floor, so it was a little frustrating. Still, there's something solid as a base, so it can easily be expanded on an improved.