Would you tell me which songs and what's wrong with them? Then I'll search it to improve them as well as I can.
But as I have said, I'm not a pro, I'm not studying music or something like that but I put a lot of effort and I try always to do my best.
Probably it's not noticed, but every song is a "reinstrumentalized song", that means there is nothing of the original song instead of the notes that are transcribed and no additional arrangement is involved.
Manoria's Cathedral an organ that I didn't wanted to sound louder to fit better to the original without change it.
In Boss Battle 1, the intro is just too hard to transcribe it and to fit in well, also the percussive organ is another challenge.
Don't be afraid and give some feedback. I'll try to answer and fix what it needs to be fixed.
Greetings