ADD BEDS! OR AT LEAST RUBBER DUCKIES! AND MAYBE DAY/NIGHT CYCLE! PETS? MAYBE AN ISLAND????
"Rubber Duckies"? Does it at least have a benefit?
The "pets" part is a bit flimsy though, cause how are you going to be able to obtain one if you can die very easily in the ocean
The island part is kind of dumb though... Why would you have an island in a game that revolves around a raft. I feel like it's kind of defeating the purpose of the game
Regarding pets, I could see having a seagull land on the raft from time to time with something in its beak. You could feed it some fish and tell it to go collect something specific you're short on. Obviously, they couldn't carry a barrel but I could see them grabbing some scrap or seeds or a tin can. Yeah, that requires a bit more intelligence than is really realistic for a bird but this is a video game.
A parrot could be a fun animal companion. While it may not be helpful in terms of collecting stuff, it could squawk when the shark approaches or give you occasional hints.