As I've already said during our lab, I like the general idea, but as it is it is definitely too small. Though the base idea is definitely scalable. I will mention again - don't force the player to restart the game. Also now that I'm looking at it again, I would be careful about the very long hallway with key - might be hard to land on as it looks like its exactly the height of the character. If that is intentional, it's okay! Though a note on this - feel free to use the character as a scale anywhere in the design - it's a very clear way to communicate measurements! Good job :)