Oh wow, this was veeeery good and well done, one of my favorites from this Jam.
It is fun, very well polished and even has a "watch the computer play" mode, I even just finished watching them go to Jupiter until the USSR rocket exploded.
I have nothing negative to say about it, only think i could think of is that there could be maybe a way to accelerate and desacelerate by pressing up or down, not that it is a problem not having this, i just think this could maybe put another variable for speed in the game. And also maybe making different stuff appear depending in which planet you are going to.
But yeah, overall, this is very great!