Aquanaut

Ocean combat

Aquanaut is a top-down bullet hell roguelike set in an accursed ocean. You fight through impossible odds, gather treasure and build up power, with drowning as the alternative.

Treasure and power

The game centers on battling and amassing hoards of treasure as you descend into the ocean’s depths. The source describes no specific weapons or other systems. The stated stakes are direct: become incredibly powerful, or drown.