Is a PSV/PS4 cross-buy cross-save title. Basically it's Defender underwater. It's playable enough and even quite good fun. Pretty bad graphics though. On the PS4, it's most obvious competition is Resogun (which is the best game on the system) so it's not great. Has less competition on the Vita but is a bit more fiddly to play on there. Especially as a lot of the screen area is wasted. I kind of like it though. Is out soon I think.