I had a lot of fun flying around at light speed, with a barely but still controllable ship smashing into literally everything! I had trouble understanding how to achieve this lightspeed state (sometimes I accelerated to max speed for a while and nothing would happen, until I bumped into something). I also wasn't sure how to use the grappling hook. It seemed to get me stuck at the point where it grappled.
Besides that though, it's a really hectic and fun game that I'd love to see more content added to in the future! Great job!