@FoxNinja, If you are talking about SmileBASIC, it is an app on the 3DS used for programming games!
That doesn't cover all the games made in SmileBASIC though, because there are TONS, so i recommended it highly!
Maybe one of the bosses could be a big enemy that when hit would split up into two and so on and so forth. I've seen a few games have a boss like that so maybe it could work in this game.
You can think what you want, but i promise you i didn't draw that sprite, Chickens32 did because it is in the sprite file for YORK.
I do wonder what language he is going to program YORK in though...