This is very cool - definitely a contender for "top-10" Arduino GLCD games! I'm impressed that you coded your own engine (I tried such a thing once myself, a long time ago, and didn't get very far with it). I'm not surprised you were able to do it in the space (other than the RAM limitations); there used to be a 4K cartridge chess game for the TRS-80 Color Computer (though there wasn't as bad a RAM limit there, but it was pretty small).
I'm still waiting for someone to port Dungeons of Daggorath to an Arduino w/ a GLCD...
