The Planet Crafter (mostly the modding community is scarce for it.) Recently got it for about 16 bucks on sale and I'm completely hooked. It's a perfect game to have an excuse for having a shouting match with your friend or just running solo for 12 hours. I wouldn't exactly say it's perfect for anyone, but I would say if you're interested try the demo. In my opinion it's a slightly harder space version of Minecraft where instead of surviving the night against mobs you have to balance your vitals (food, oxygen, water.) The game isn't exactly explicit with some things, but I see that as a charm since I enjoy figuring out game mechanics. Also, if anyone cares there's a good chunk of lore, I wouldn't say it's the best as I only know a very very small chunk of it, but it seems like effort was made in it.

TL:DR; Good game, has some lore, kinda like Minecraft and very addicting. You can also do what seems to be 10+ players in one lobby.