Crab Nebula: I really like the instrumentation you chose. The plucky instrumentation juxtaposed with the heavy bass and percussion give a swamp-like quality which also doubles as describing an alien-like environment fitting an area of space that maybe is more dilapidated.
SSTC2D (Young Stellar Object): The decay on the rhythmic elements gives a very nice cavernous feel fitting for the environment you describe. The siren-like sounds that emerge half way in sound very alien-like and they make me wonder whether or not I’m in danger in this area. The choral aspects with the grounding percussion beat serve to reassure me that while we are far from home, there is some semblance of confidence conveyed here. I can hear some of the Metroid inspiration in this track!
Great Comet of 1843: One of my favorite video game space tracks is X-Naut Fortress from Paper Mario the Thousand Year Door. I noticed quite a few similarities between this track and that one and it certainly had me dancing and grooving along! I like how the track builds with time and becomes more and more epic and heroic sounding. The exploration with the different acoustic instruments (violin and flute) are interesting touches and I think do a nice job of highlighting the humanness that accompanies the space-like electronic sounds. This is a great way to truly represent all aspects of the image!
Overall, this adventure seems to take us in many different directions and there are many different gameplay elements you imagine! Despite that variety, I think there is cohesion in the tracks and I imagine them working together to serve as different worlds within a single game. Good work and thank you for sharing!