I don't know what the player character is but I want to hug it.
I found the mechanics pretty easy to figure out, even though the game doesn't explain much to you. It really helped that for example "locking" a room's number shows an actual lock on the action and you use a key to do it. It's very intuitive
The only thing I wish I knew, but I don't know how you'd convey this, is that the hammer guys who can reroll the numbers on rooms can be used again as long as they are not the last one you used. At first I thought if I didn't get the numbers right after using them all I was toast.