Hopefully the Developers reads all the Comments in this Thread. (Well, not all but, you know.)
First off, Day and Night Cycle really Important. Sure that you guys are working on this but, I'll just leave It here.
- a Way to Reinforce the Foundations, E.g Foundation ---> Reinforced Foundation ---> Metal Reinforced Foundation etc.
- Difficulty Options, with Increasing Sharks the Harder the Difficulty is Set.
- Breaking/Health Animations for Certain Objects If not, all. *Important* Since you wouldn't know when the Foundations are being Gnawed at and rendering the Repair Useless. Trees as well. (The Forest)
-Probably make the Foundation more Larger?
-Animations for the water! like, you know, Wavy! the Raft needs to be Wavy since It's floating on Water.
-Variety of Sharks? Megalodon :D
-Weather!
-Islands? Subnautica?
-Wreckage of Ships that you can loot on! and maybe find a Diving Suit or a Rebreather!
-Upgrade the Graphics? or is it Change the Engine? not sure but It'll be nice If you guys could really bring out the life on the Water since It's 90% Water (Unless you played for 2-4 Hours) anyways. Seeing Subnautica's Waters is really good.
-Temperature! when night, the Cold strikes. You'll need to stay Warm or else you'll die out of Hyperthermia and too much heat as well. Vice versa.
-Realistic Weights so that when you don't upgrade your foundation when you put certain Objects like the Tree farm? (Forgot the name) It won't Sink.
*Edit - and a Backpack as well. a Craftable one and one that you can find somewhere.
-Variety of food. (Though the Coconuts are enough to last your entire life killing Thousands of Sharks).
-Spoilage of Food and more Crafting!
*Eh, forgot one thing.. the Harpoon! where you'll find It on some Ship Wrecked Yatch along the way.
*I Forgot one again, SPIKES! or TRAPS for the DAMN Sharks to Gnaw into! they'll get stuck into It and have time to go the Shark and kill It! though If you are late, they'll get away and be More Aggressive Afterwards. Just to add a Few Seconds before they escape again.
*Sorry, Last one. Crafting! Bows, with a Variety of Arrows that you can Craft, a Reinforced one and a Metal Reinforced one. and on How long you have drawn the Bow, the More damage It deals. It's good for have the Shark stop gnawing the Foundation. best for when the Shark is Trap you can the one shot It. also good for hunting down Birds and Collect their Feathers. *Note* Feathers and Sticks are needed in order to Craft the Arrows. Planks = 4-6 Sticks and Feathers sometimes Drop on the Sky or when you hit Birds that Stops by to your Raft.
-Specific Storage for Objects :D Food Storage and what not.
That's all I Could think for now. :) hopefully this won't be another Stranded Deep.