I like your idea of keeping piano only for the theme, and the emotional vibe of the tracks is nice !
I agree with the comment below, maybe some changes of keys could have been nice.
I also noticed in Death that some notes encounters are a bit harsh, but given it's the Death theme it's probably wanted !
Personnal favorite is Freedom, I could not help but think about Nier's OST "Songs of the ancient", I don't know if it was your inspiration on this one :D
Anyway nice musical journey, well done !