I hope this thread isn't too old for me to comment on, but hi, I composed the music for Her Tears Were My Light! (I've read manga here before but haven't been on the forums)
I'm glad you liked the game and the soundtrack! I was a fan of Nami's art style before this, but yeah, the gameplay got me even more excited about the game when I was playing through early versions of it.
Regarding the music, the instrument timbres I chose were mainly influenced by an early draft of the title theme that Nami came up with as well as game soundtracks like this: https://www.youtube.com/watch?v=TyspcHlBWco&list=PL392784AE8CE5A03C&index=10
I did intentionally choose virtual synthesizers that are meant to imitate older sound chips (without limiting myself to purely 8-bit sounds) since I wanted to maintain the general style that Nami tends to go for in her own music, which you can hear in her RPG Maker games.
Also, the game's plot does seem to have the kind of yuri romance that people here would enjoy, so there's that going for it too!