It's called Tower of Babel. The gameplay loop is pretty simple: you mine stone, chisel them into bricks, carry them to the top and place them on the tower.
What makes it kinda interesting is that the tower is persistent and shared across all instances. Every brick anyone has ever placed will stay there and bricks from other servers will be synced. So you are not just building your own small tower, you're adding to a tower that keeps growing and might one day reach the clouds.
There's no end goal (other then being the one with the most bricks placed). Just the tower getting taller and working together.
It's available right now if you want to check it out.
https://sbox.game/sloth/tower_of_babel
I spent way too much time on this but I'm proud of it and would love to hear what you guys think.
Some things might be broken in multiplayer. Networking is hard sadly.