Awesome project! We also did a train game... just not in space XD Kidding aside, I had fun playing your game. The music choice is phenomenal. The gameplay is responsive. I'd say a tutorial could help since there is quite a bit going on. For example, for me it was not immediately obvious that I had to manually use power-ups, I thought they were activated at the moment of pick-up specially since some items like the gatling gun do activate right away. Still, well done and good luck!