Reached the space ship twice and was also really surprised that the planets all look different. Great Job! Music is funny at the beginning at least :-D, would suggest to implement a sound+music slider.
Yep, colours and ground height map are procedurally generated each time the level loads :)
I've never done a music / sfx slider, but I presume that it wouldn't be too difficult, I've already got music and sfx on different busses
