Well, this is one of my all-time personal favourites. Ten out of ten for originality. It's so much fun to fire the catapult, especially if you can be sneaky enough to cause one of your classmates to take the blame for it. Always satisfyingly hilarious, that is. :)
Good use of BRIGHT attributes to shade the walls and give the background graphics some depth. The in-game characters are memorable and it's good how the "main characters" instantly stand out well from the pack of "generic pupils". It's really quite amazing how many sprites are moving around the screen at the same time.
Only problem for me is that I've spent so much time just randomly larking around in the game, I've never actually completed it. Maybe one day I will achieve this!