My ultimate goal is to make a proper cRPG eventually and the idea was to set it on a water planet, where you would essentially create some kind of salvage/adventuring party with Big Jim suits acting as armor. Combat would be a mix of shipboard conflict and
underwater battlefields. I liked the idea of having semi-aquatic races to pick from... Underwater temples filled with manta ray warriors or jellyfish men. Lots of setting specific weapons obviously harpoons, bomb lances... Shit they killed whales with.
I'm terrible at describing things with words I should just do a mock up. Essentially I want it to feel like Baldur's Gate set mostly on the ocean and underwater.
Mark doesn't like underwater settings though. I've been chipping away at him about this over the years. Maybe the mockup would help.
And gillmen I hope?
You should do a mockup, or better yet a game in this setting. Sounds awesome.