Any survival games with a lot of content?

Don't Starve, probably one of the bests.
The Long Dark, also a cool game.
Starbound, you will love this game because it's developed by the same guys who developed Terraria or friends of those guys I'm not sure. But game itself is great, if you won't consider it as a ripoff.

I like Roblox as you can play thousands of different games created by other players this is also free which is cool!