One of the more unique locations that I have come across so far. I really feel like you can go far with this idea. This is the type of game where you can get away with simple hand drawn art instead of blocking out the level like you did. The character art is perfect, why not do this for all aspects of the game? How about adding some in some other colors each with their own effect? How can you incorporate the sticky notes, magnets, and other items in to the gameplay?
Would love to see more, great start.