i played for half an hour trying to interact with everything, nothing works, I got that card thing from near the monster at the start and trying to interact with the door thing but it didn't work, save me!
i ended up finding that room where the card worked, just to get another card, and then went to explore a bunch of empty rooms. I think the game's world/level was made to big for its own good. Should've made it smaller with more depth rather than too spread out and empty.