I have some ideas to improve the Raft experience. (If something is not understood well, I'm sorry I speak Spanish and I'm using google translator)
+ Put a difficulty meter (To be able to avoid the shark, for example)
+Add islands to increase the adventure
+Enhanced storage space for better storage
+Longer length of the game, since you can get all the Objects in an hour and a half more or less
That's all, I want to say that the game I like a lot and that's why I want to help trying to give ideas.
Goodbye.
GamerTiger