Pretty crazy. You got so many characters and combinations. I like how quickly everything goes by, as well as how over-the-top some attacks get. There's a lot of stuff here, and you did a good job.
But I wasn't able get too far, because I couldn't figure out how to make new ships. I press tab, select "New Ship", and nothing happens-- using the arrow keys makes a sound like it's moving a cursor, but there's no visible menu, and pressing Z does nothing. Because of this, when getting to an enemy that's immune to the attacks of both my characters, I can't damage them at all and lose my only pair. Is this a bug, or am I missing something obvious here?
In short, 'twas arcade-like in a good way.