What about a skill tree, like in Cursed Treasure: Don't Touch My Gems? I like what Iriysoft did so why not ask him, Ninjakiwi? "Hey, can I borrow your idea about the skills?" That would be AWESOME!
Gets boring with time, BUT (there is always a but :D) You should get all respect for making a game which had no plot at all, but still was kind of bad-assed :D