While I liked the game a lot, I must agree with GarageGothic's assessment. The murder plot has major logical holes in it - so big, in fact, that when I read about the suspect on these forums, I discarded the idea as speculation, it was so ridiculous. I really don't know who was the murderer, as iI believe it's next to impossible to figure it out by reasoning.
Nevertheless, it's still an awesome game - as an "amateur" game, it beats many, many, many commercial games in quality, detail and fun. (The music is also wonderful.) So even with the flaws that GG (and some others) mentioned, I'd still give this game at least 9 out of 10.
