Main idea:A level with a cosmos theme.You start in the planet Mercury and you have to go end up in Neptune.
For each planet there will be only one gamemode like in earth cube in mars ship and so on.At the end of each planet you will have to go to a rocket ship to go to the next planet.
Secondary ideas:There are some bossfights with aliens you will have to defeat to go to the next planet.My priorities would be quality and time to keep it simple and fun.Also there could be some underwater parts in mars and storm part in jupiter or i could also extend the level so it reaches to ton618 (holy gd reference) or other planets and stars