As part of Space Month I wanted to use these colliding planets to illustrate how easy it is to incorporate random behaviour into any game you make. Take a look at the blocks and think about how to make it truly random. Maybe randomise the starting position and trajectory of each planet when the green flag is ticked?
I love randomness in games, factoring it into the games you make means that even you (the game’s creator) doesn’t even know how the game is going to play out.