Collected 144 crystals, then I couldn’t find any more. :(
It was a fun game though. My only criticism really is that the player suffers from a lot of inertia, meaning that it’s very difficult to change direction or stop in place. I wouldn’t have been bothered by this (this is how physics work after all), but it didn’t seem like the enemies had the same property which means it’s pretty much impossible to dodge an enemy coming straight for you. The fact that enemies explode when they collide with each other was a good way to somewhat mitigate this though, and was a nice touch. It was also sometimes possible to catch enemies behind an asteroid and get a head start, which was pretty cool but there weren’t that many asteroids, so it didn’t happen very often. Overall though, I liked it. Good work. :)