Risk of Rain has a very hit and miss soundtrack depending on the persson,i personally like most of it but you might not agree with me
https://chrischristodoulou.bandcamp.com/album/risk-of-rain
Hey here is one im sure you probrably didnt get yet
The Last Federation (i dont even know if this can be considered a X4 or a turn based but,there you go)
https://arcenmusic.bandcamp.com/album/the-last-federation
here is one i think you would find sonner or later but im gonna speed up the process (unfortunally i think only a few of the ones in this soundtrack are any good outside the game so im just gonna give you the good ones[or at least the ones i think are good])
Tower Of Guns
https://mikemirabello.bandcamp.com/track/induction
https://mikemirabello.bandcamp.com/track/salutation
https://mikemirabello.bandcamp.com/track/caution
https://mikemirabello.bandcamp.com/track/industrialization
also
Happy Birthday Ross!