Hey! Pardon the slow response, busy December!
If you press "?" while playing, it shows the full set of controls! Also, stairs don't actually matter. The adventurer who goes through the dungeon and makes a big mess of it spawns at the up stair, and finishes at the down stair, but that's used during level generation and doesn't come up during play; you just get to clean up the aftermath :)
Birds are absolutely fantastic! I made this quite a few years ago, and I was still learning, so I don't have any plans to update this. But, I will 100% ensure that my next game includes birds.