- First off, good grammar/spelling. I shouldn't really be complimenting this, but the unfortunate fact is that quite a few first cases wind up with bad grammar or spelling that makes them hard to take seriously.
- Writing out the sound effects in the dialogue box (the whole *sneak* *tiptoe* *creep* thing) makes the scene come across as a bit silly, and you lose a bit of tension in the intro.
- Not too huge a deal, but I would try to find a more fitting background for the classroom rather than the very iconic Courtroom BGs. I can see why you chose it, though, and the scene goes by quickly enough that it probably doesn't really matter.
- The prologue scene itself does strike me as odd. I feel it goes on a bit too long and feels more like homework to work our way up to the actual story when we could have recapped this or slowly unraveled it throughout the case. The hook of "wait, why is Franziska a DA now?" would likely engage the player more than the long explanations in the prologue. I suggest peppering in this intro around the lobby scenes, or during the initial "Ms. Von Karma what are you doing there" reactions. Not to sound like I'm ragging too much, I found the explanations that were given believable enough, which is the main sticking point anyways. It's not bad to have for the demo, but I would suggest trimming it down or working it in better for the full release.
- It is a bit distracting that the case against Pearl is VERY paper-thin, even for an AA case. The entire argument is "she was at the detention center, her fingerprints were on the weapon". No questions of "how on earth did a small child smuggle a weapon through a high-security area", "did a small girl even have the physical strength or mental fortitude to stab a grown man in the head", or even "what was the motive for this child to kill a man she presumably has never even met?".
- The choice of Apollo for the Prosecutor stock sprite is also a bit head-tilting. He doesn't resemble Sawhit that much (I'd say Payne is probably a closer match), and the first thing anyone will think upon seeing him is "What the hell, why is Apollo prosecuting?". If a reason turns up later, I'll redact this statement. From a story standpoint, I'd say that it is also a bit head tilting that this guy just "became a Prosecutor" in order to take this case. I think what you were going for is that "he was a defense attorney who swapped over", but that hasn't really been made clear.
- "What was the victim doing out of his cell?" I feel that the exact location of the murder wasn't established well enough. Gumshoe's statement is really the first time in-trial that it's been brought up. This could easily be fixed with Franziska saying "The halls of the prison... You mean to say that this prisoner had escaped his cell!?" or something more clear. This question is also pretty darn important, and shouldn't really be handwaved like it is.
- The knife reads "only fingerprints are those of the victim's", which I presume means to be "of the defendant."
- Oh, and there's the end. Well, good show. I posted my nitpicks above but the overall product looks pretty promising. The case in general looks well put-together and the logic hasn't left me with many gaping questions (or at least not enough to make me feel like the plot is utterly silly). I don't really have a ton to judge with only this, but I hope my thoughts have been helpful. Good luck!