I didn't mean that the bosses themselves had uninspired designs, they actually reminded me of Gunstar Heroes bosses, and that game had rather unique bosses. I meant it more as in that the game might have a bit of a hard time standing out at the moment due to similar very high quality alternatives existing, though Pedrovin's art might help make up for that so I don't really know.
It's possible you might even be able to ride on the coat-tail of a certain other recently released and very popular boss rush game. It's certainly different enough so that people will most likely see it as its own thing.