To much to ask for at this time, but would be fun to have more stages, dragon/hoard sizes, upgrades, and cutscenes. Could be interesting even to branch out and add other game modes after reaching certain milestones, such as since the dragon grows so could the kobolds too (with or without dragon assistance) if say instead of sneaking around to grab money, you beat it out of them ^^; "fear the "tax" / tribute collector! (Simple magic can be utilized to transform them for desired task player chooses). This is just for ideas in general if you wish to expand (pardon the pun) upon the game.
That aside there are still some bugs in the game, mostly dealing with ? and ! not appearing over some characters and they suddenly go after you, characters having trouble resetting to their initial position after moving/chasing, and worst is getting stuck in and blocking doorway because of belly and door collision.
Last question which may be bit spoiler, but what is the gold needed for max dragon/hoard size?