Starbound. It looked like one of those early access Terraria knock-offs to me until I finally got it on sale, and found out that there is a TON of stuff to do. I never made it far in Terraria for some reason - perhaps it was a lack of time or disinterest in the setting - but the main difference seems to be that with Starbound, you only have to put a couple of hours of playtime in to access the tools necessary for you to explore the infinite, star-studded universe. You also get to pilot mechs and build space stations, so this one checks most of the boxes for me. As an added bonus, it runs nicely on my definitely-not-for-gaming computer thanks to the 2D perspective.
I haven't played Starbound in awhile, but I really enjoyed it when I did. My brother and I played co-op through the beginnings of the campaign, but just far enough to get ships and be able to do what we wanted. We then built a house in the side of a mountain on an ice world, complete with crops and animals. It was pretty great.
Highly recommend it! I also love Stardew Valley. I've always wanted to play some legit DnD ever since we tried a few sessions of Pathfinder back at summer camp, but will have to warm up my group to the idea. I have Gloomhaven coming in...someday. We'll see how that goes.