I've been expanding the maps where possible, as there is a lot of unused map space, and abandoned areas. Alas, replicating most of the maps from Blaster Master Zero aren't possible due to Blaster Master's compression system. I'm not changing absolutely everything in the game, because a lot in Zero is essentially the same as it is in the original. I don't have much else left to change, as I've just been changing things on a whim here and there. Come to think of it, I should probably submit it to the site tonight. Anything else I could change dramatically could be done as a separate hack, and as far as I can tell, all of the tile errors from the original game have been fixed.