AND THIS WAS DONE ON FL MOBILE?! DUDE YOU COOKED
Title theme - satisfying intro with chill vibes, melody-wise has this feel of slight uncertainty because of some chords and I think it was intentional to make the player more immersed.
Menu theme - A nice touch with leitmotifs, and the main melody is simple but nice, a bit too rough chords, but it's understandable since you made this whole track on frickin FL MOBILE.
Feather Garden - the main synth has a weird melody, but I think it was intentional here. Also a tip about the piano - instead of making the chords slam repeatedly like that try making arpeggios out of them - would sound much more smooth and "flowing" :3
Moonlit Sunflower Core - probably the best track in the whole OST both quality-wise and composition-wise. The harp doing 7th chords gives it a slight ethereal feel and the reversed percussion compliments it nicely.
What Remains phase 1 - MAJESTIC INTRO. Buuut, lack of percussion, and the trumpets sound very weird because of slow attack, try moving it closer to zero and making release a bit longer instead. The transition into the "bridge" in the end is heavenly tho. Overall melody sounds melancholic, but not intense nor tense, could use a bit of Frygian mode I think, or maybe harmonic minor for dramatic feeling.
What Remains phase 2 - satisfying Pokemon ahh intro, and HELL YEAH DRUMS!!!!!!!!!!!!!!!!! Drum patterns are pretty nice, but the melody just sounds off, not even because of mixing quality or the synths, but it just sounds random and at the same time simple. I think first thing you should consider is rhythm - Before making a melody try making a pattern out of notes of the same tone and try making it sound interesting, and only after that make the melody. Also, I think you've overdone a bit with the chords - I think they are the main reason the melody osunds weird, Once again, try making arpeggios aout of those chords or just leave the leading notes from these chords, this way the melody would be at the very least more clear. And now that I think about it, I think I understand why it sounds so off - the whole melody is pretty just the same basic major chord repeating and changing in tone. So yeah, probably making there be a bit less chords could be nice :3
Credits - even despite bad mixing, it does bring finality to the prevoius tracks. A nice thing to finish off on. Tho towards the middle of the song there's the same problem with chords again, but the end of the song is just chef's kiss.
Overall - aside from bad mixing for obvious reasons, some of the songs have a bit strange melodies because of the chords they play in. Also the story is more of a concept than anything, although an interesting one... But dude THE FACT THAT YOU MADE IT IN FL MOBILE... I could never.