seems like the level with the prison is the only content in game so far.

That was the demo, this is early acess, has the first area, some 15 hours gameplay, they have released 3 patches already i think, improving stability and making some changes, like adding a chest for the player to put his things, since there is a crafting system, this was essencial.

I keep getting 'get some rest' at the end on the beach and night won't fall no matter what. Should I just make a new save?

oh wait I'm dumb. I just have to activate the boat. Good.

Yeah the night is strange, they should make this game darker, way darker, and maybe make the night more dangerous, i can only tell night from day because the NPCs go to sleep.