Good, zany fun for two players. I like the pace and the sail-dodge-shoot-dodge rhythm of the game very much. There is a good variety of upgrades, and the option to ram your opponent out of the water is great when you can pull it off.
It's a small game, so it does not have much replayability - but the few rounds we played were intense and fun!
HP upgrades can cause a bit of trouble - when one player grabs a bunch of those, it's really hard to take the lead back from him/her. Also, an option to turn "ring outs" off would be appreciated, for those that dislike the mechanic - the core shooting gameplay could stand alone.