Hi, thanks for playing :)
Originally I wanted to add there black hole, which would be increasing on size each time, something would fell in it, until it would consume whole space, but that become too complex and ambitious for me to finish on time. At the end of the day, I had increasing amount of asteroids, which make "asteroid pollution to grow" and your goal is to keep it on low levels. It could follow better the theme, however, in my experience level, I could make at least asteroids amount growth :)
Also this is my first game and first jam :D