Outer Wilds has 6dof in your spaceship. It has modestly accurate spaceflight, though everything is on a tiny scale. You can fly from planets, into space, match velocities, etc. It's a game about exploration and mystery without any combat, though.

I like how the games allow the ability to freely move in and out of my ship and the game worlds offer a good amount of exploration. And it might sound silly, but I like being able to perform maintenance on my ship.

Again, this is just my thoughts on it and might not give off the same feelings to others.