Cool concept. Took me quite a while to figure out that you needed the asteroids behind you in order to mine. I was also confused how to pickup the minerals after destroying an asteroid with your laser, as I had assumed it would be the same button as mining (E), rather than a number. I've tried quite a few runs and have yet to successfully sent any rare minerals to collect money.
It seemed like might have been a couple of bugs. At one point, I had around 22t of putonium but no fuel in my boosters. I'm not sure if there was another step I needed to take to convert that into fuel.
Overall, great idea, and really liked the art as well.