I think the concept is really cool. You have a case where someone is murdered, but with very little information. There's multiple suspects, which some of them seem to have a close relationship with the victim, and your job is to find out who did it.
I really liked the music too. It did help set the mood, as I was reading the report(s) and the suspects' profiles. Even though I thought some of the characters looked rather odd; the visuals were pretty great.
I didn't noticed this, but during my second play through I saw some information was changed (cause of death, location of the body, etc.), in which I thought was neat. Though the only fault of that is the dialogue of each suspect remained the same, and I remember one of them mentioned stabbing on my first play-through.
However, here's where I think it falls flat (and you can correct me on this if I'm wrong):
I felt that the plot was all over the place. It was really cool to see that I was progressing with the case by interrogating with the suspects, in which some information I got out of was "Oh, I heard X person had an argument with Y person." But then when I interrogate with Y and the later, I unravel that there was a love triangle going on, or there was a business relationship that got busted, or there was more blackmailing, and so on. Everything was all over the place, and I felt overwhelmed with some of the information. I ended up trusting my gut and locked up the correct person at the end.
Overall, I did like it and I hope you continue to expand on this.