>>538604843
Game idea: Coral Reef city builder.
You play as a sentient coral reef and have to grow tubes n shit and get fish to live in them. You have lots of specialised "buildings" to attract different species of fish. They're both population and resource because they have to eat each other.
It's also important to maintain an attractive look so you can get human tourists and collect their dropped cameras, phones and cash to upgrade your tech tree.