Decent idea. The collision detection was frustrating though, the first time I played I got stuck inside a wall and had to start over, and walking up and down the stairs was one of the hardest parts. This could be really good but I think the puzzles needed to explore the theme more. I found that if ever I couldn't advance I could just go up or down the stairs and try again without much thought for what I was trying to achieve. Very nice submission though!