A very unique idea, and I love the theme of being a death row inmate being used to do a job with a high risk of death. The idea reminds me of Lethal Company and SCP Foundation stuf, very cool! Theres definitely a lot of social commentary to be made in there!
As for gameplay, the flying is great. Definitely a learning curve but not necessarily in a bad way. You could probably do with a speed gauge though, and maybe an indicator to show the direction you're moving in. I'd look to games like Space Engineers and see how they do their ship movement for inspiration. Great start though!
My last critique is that it is far too dark. It's very hard to identify asteroids to travel to, and my ship's flashlights are long enough meaning that if I go too fast I crash into it before I even had time to properly react.
Those critiques are small in the grand scheme of things, though. You have a lot of potential with this idea!