Fun game! I liked the dodging of the spiky mines. I agree with RubenMG that it would be worth the practice to add some juiciness to everything (everyone is always talking about game juice now a days). Maybe a particle effect when drilling in the asteroids, or a nice explosion when hitting a mine. Lots of good potential there. I liked the slowdown when drilling. It changed the pace nicely. 

Simple but fun.
What infuriated me was the fact, that I needed to press Enter in some situations, while the game is controlled with mouse. I'd love to press the mouse button instead.
I'd personally do some improvements here and there, but overally good work!