I think the fact that the character art is limited to a very specific kind of game (a launch-the-character game), that it is only really viable for you to simply find a coder and try to make a game from it. I mean, why not? You already did the biggest part; with some backgrounds, the objects, and the cannons, you would be set with a pretty damned good looking game, that would definitely sell more than the time you would put in.