Thank you! For the asteroids, I used a 3d software called Blender (You've probably heard of it). I animated them and added a toon shader wich made the hard shadows you see in the final image. Then I just rendered it to a low resolution and voila, you have a cool pixel art asteroid! The explosions and comet trails were just normal particle emitters. I was really surprised at how powerful the particle system in Godot is!