Um, did you put all of your graphics in that spritesheet? It looks like there's a couple of sprites (like the school) which aren't in the spritesheet you attached.
Oh, I think I forgot to mention, but everything else was made with a 1x1 pixel in the top left corner. I just changed the tint of a bunch of objects...it might be a loophole but I think it's technically not breaking any rules?
