I'm with nanashi, I wouldn't mind it a bit darker, even just a light grey would be better. Background is kind of lame/doesn't work well too in my opinion.
Not that it actually needs to be changed though.
Could you reupload, mainly just the part 2 rar in katfile.
https://www.anime-sharing.com/threads/2000-keroq-nijuuei(二重影)-fix-win10-game-voice-edition-crack.1574081/#post-6821386
Thank you for your time.