I liked the cosmos suggestion because I love space and the others were not that interesting to me.
The main idea is were you go through different clouds of dust and see stars and planets forming
You start by being in a big cloud of dust and see a star form and planets form around it.
Then as we get the the drop we see many stars forming and its memory. the gimick is that you have to navigate the stars path and another optional one is were there is a hard duel at the end of the level were you become a black hole after super nova
I think i will go for high quality levels that are finished quickly because i think quality is more important then optimization and i dont want it to take months.