It's kind of like an underwater shoot-em-up, but the line-of-sight rules remind me of a roguelike. So, yeah, I'm not entirely sure what it is. You scoot around in a submarine, firing giant torpedoes at your foes. They start out as harmless lifeforms like fish and whales but, as you can see in the screenshot here, they eventually transform into more bizarre and dangerous creatures.
The creator, who goes by the handle of "ektomarch", describes the game like this on his blog:
Nazis in Hell fighting demons.
Yep, I can get on board with that! He goes on to mention the full game features 20,000 lines of code, 25 tunes and a staggering 118 levels. That's a lot of content. You should get between three to five hours out of it, though five is more likely, he says.
Subbania [Chrome Store]