This is a huge market right now.
Hurtworld, Grav, Subnautica, and Rust come first to mind.
This may help too,
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If you're looking for great online moments, Rust 100%.
If you only want to play with friends in a private session, and you're ok with 2D, Terraria. (Waaaaaaaaaaaaaaay more content than minecraft).
I do not recommend Hurtworld, since everybody is saying that devs kinda abandoned it (was going to buy it myself).
ARK might be great, it needs a good computer to have the full experience. There is GRAV, and some others, but I think Rust beats them all
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What about Don't Starve (if you prefer single player) or Don't Starve Together (if you prefer multiplayer)??
http://store.steampowered.com/app/219740
http://store.steampowered.com/app/322330
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Space engineers? http://store.steampowered.com/app/244850/
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I wanna buy some of that for that summer D:
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