Hey Trask, play Terraria!

Terraria is a game where you explore a world, create and discover powerful or mundane items, defeat some powerful creatures, build and survive. At first glance, as many have said, it's 2D minecraft. It's a lot more
It also has co-op, so you can play with Kestrel (and many others if you wish) on your own server.
you can get it on Steam.