I didn't use Kepler Laws for the planets, it was just RotateAround(); for the projectiles I used Newton's law of universal gravitation. The purple and white projectiles did appear in the instructions (I'm gonna put those images at the end of the reply). You can use WASD to move the camera (also in the instructions) and go for planets that are far away. Thanks for the feedback btw!
I didn't explain myself well.
I saw the instructions. I read them carefully. I knew exactly what the purple and white things did.
The problem was, the colors themselves didn't resonate with me. Why does purple promote atmospheric density? That's why I was looking for some techno-babble to hang my immersion on. eg: purple projectiles are filled with neutronium anti-particles which will eliminate the ozone layer on a planet. The jargon could be anything, really. Red and blue are obviously hot and cold, so they don't have the same problem.
But it's cool if you don't want to have that in the game.
Regarding the camera. I knew about moving the camera, but that didn't change the point of origin for the shot, so it made more sense to wait until the planet came around.
