Raft is the kind of game I can sit down and play for 30 minutes and all the sudden it's been five hours.
The recent update, as of writing this (2019-06-14), made it even better by adding much more content and stuff you can make.
The game starts you off on a 2x2 boarded raft and you're mission is to hook planks, plastic and palm leaves from the ocean, with these you can then make various other materials and building blocks.
Your first priority is water, second is food, third is building more and doing more awesome stuff.
Soon enough you can get a sail and anchor which allows you to explore islands where you can find coconuts, mangos and other cool stuff. You can also explore the seabed for clay, sand, stones and other stuff.
If you like survival, you'll like this!