This is a cool soundtrack! I like your instrument choices a lot, and the synths are very very nice! I also like the cohesiveness of how you structured your soundtrack! A little bit of a subjective criticism, I love the drum timbres you've chosen but I would've liked to see a bit more variation in the drums patterns given the more ambient structure (especially in track 1 and 2), but that is just a matter of personal taste, and I don't dislike the drum pattern you have currently - I still think they are nice. I also really like the interpretation of the theme and your progressions highlight a vastness with a hint of eerieness which I think fits perfectly for space! Very nicely done!