Another idea off the IRC chat. Liquid ocean planets could have space dolphins, space whales and other fish species specific to ocean world types Bosses, ingredients, other elements of gameplay
Dolphins flying spaceships, if a space based trade-combat system is ever introduced as well or asteroids filled with water with space whales inside
Space dolphins should be mounts and you should be able to do flips for trophies. They should use a similar physics model to Ecco the Dolphin, or Dolphin Olympics 2.
The idea behind echo the dolphin is a good one, be able to ride space or ocean dolphins like pets through ocean environments
HERP DERP SPACE DOLPHINS idk, having space dolphins instead of space pirates or something like that would be pretty cool. It'd be all like, "WE'RE GOING TO TAKE OVER YOUR SHIP!" "Awwwww, look at the cute little space dolphin" ouo
So sorry it had to come to this. (xD) Edit to keep from double posting: Hey, Ollobrains, do you mind if I make my own thread elaborating on this idea? I'll link to this original thread and everything, and give you credit for the original idea.