Defend the unstable star in the middle. Hit rocks and meteorites to destroy them. If the unstable star gets touched or triggered, it will go supernova (basically incredibly large and hot explosion) and end your run. Click to fling yourself (more distance from cursor = more power). You fling in the opposite direction from your cursor. You also bounce off of the screen edges. Space to become unstable. The longer you hold it, the more unstable you become. Fill up your Instability to become more unstable. It's used as a power move to obliterate enemies. E to toggle information (Instability and Kills). M to mute/unmute music.
The Score is your Time + (Kills x 5) + (Meteorites x 20). For example, if your time was 100, then you add 100 to the score. Then if your kills were 50, you'd take that and multiply it by 5, which is 250. So 100 + 250 which equals 350. Then if your meteorites were 5, you'd take that and multiply it by 20, which equals 100. So 350 + 100 which is 450, aka your score. Also don't question the background. It makes no sense, and I'm aware of that. I just didn't want a blank starry field. Fire (from meteorites) doesn't make sense either because there's no oxygen in space to create fire, but it looks cool.