...unusual in a lot of ways.
Now... at first glance, this appears to be a little underwater exploration/shooter that lifts a few mechanics from my beloved Galak-Z (and it is). It's even a Metroidvania - which if what Galak-Z started out as - but everything else is weeeird...
First, it's the next thing from Insomniac, who used to make those fantastic Ratchet & Clank games, but more recently has made middling third-person shooters and mostly bad Ratchet & Clank games. It's also their first large-scale 2D game since... well, ever.
...but not too large-scale. They're planning on a fifteen dollar price point, which brings us to the second weird thing - Song of the Sea will be the first game published by GameStop.
Not kidding. There's a whole frickin' GameIndustry article about it.