Wow, your stuff is very impressive.
The ufoai_missiontrack01 composition is shaping up really well.. I really like the reverberating waxing and waning alien sounding harmonies and the way you have managed to mesh it altogether so seamlessly. Definitely sets a really great atmosphere. I think it would suit a mission set it Africa somewhere.
I like the dynamic start of the Suns of Another World track and the drums sound very sweet. One thing I didn't like so much as the song progressed though was the electronic tone which is used through a large part of the piece. Initially its rhythm works reasonably well but I think it gets a bit too prominent and a bit too monotonous eventually, even though the rhythm does speed up nearer the end. Maybe this particular tone could be made to have more texture or perhaps you could vary the note here or there... I'm not sure (take all this with a grain of salt, I'm not a musician, these are just my thoughts). The track overall has more of an action feeling and this is something we definitely need more of in the game (melodic atmospheric music is great, but if some fast paced sequences can be built in as well, that can help build tension).
Looking forward to hearing more, and feel free to experiment and push the music in whatever direction you want.