so uh what is this game, how do i download it, and is it a game where i can make my own ship and do stuff because if so then refer to my second question
This is Starmade. It's like minecraft in several ways except instead of an infinite land you can explore, its an infinite universe of planets and space stations and stars.
You can download it and play the full version for free
here.
Yes, you can make your own ship and do whatever you want with it. You can make interiors and with gravity blocks you can walk around inside the ship while the ship is moving. It's very cool.