Interesting concept, I do like murder mysteries! I found the killer, but I wasn't that impressed with the mystery. I just ended up looking for contradictory statements, and guessed based on that.
In general, I think it'd be more fun if you had more to do, instead of just reading. Like building up a timeline, on some UI or something, or "answering questions" about the mystery. A bit like what a game like Return of the Obra Dinn does. Progress to the resolution bit by bit, and then be able to make a guess who killed the count based on process of elimination.
Other than that, it feels a little short with just one mystery. I understand that your angle was going for procedural generation. It could work, but I'm personally of the opinion that I don't think the fun in the replayability it would add would weigh up to a well-crafted handmade mystery that you would just play once. Unless it's done really well.
Anyway, good job!