Sure I'm on windows, 11th Gen Intel(R) Core(TM) i5-11600K @ 3.90GHz 3.91 GHz, NVDIA Geforce RTX 3060.
The music to me has some odd placement like when we first meet the reapers the first time I rather it stayed in that first music tone until it entirely change scene since to me the early chat has the same tone but it went into this slightly battle-ish music mid-conversation (idk the music name but it was more quicker pace) before going back to slow. I suppose it all comes to the music choice and placement could be better.
For the transtitions, I felt most are really sudden or sometimes the transtition is very short so it immediately goes to another scene which surprise me I even checked if the transtition setting was off but it was fine. It was like experiencing a jump cut.
For the messaging system renpy has some good messaging frameworks. The best ones are in russians lol, but pretty easy to use sDextra messenger is the one I used as it can also play audio clips and click images and has choices integrated into the text which should prevent the choice error -- as it's a common error in renpy if messaging systems aren't coded correctly due to the screen label clash. Good luck!