Hi - I haven't played the three cases yet, so this isn't feedback on the mechanic. But I read your "Before you begin" screen twice, and I wanted to say something about that instead.
I'm building a deduction game with a related problem: the player is judged on whether their reasoning is well formed, before anything is said about whether they're right. And I've been stuck on how to learn where remote testers stop, since you can't watch them.
Your opening screen answers that better than anything I've come up with. Recording whether someone changed a ruling before committing. Saying plainly what is and isn't stored, including what happens if the browser blocks it. And especially this:
"please do stop when you feel like, rather than pushing through out of politeness"
I had that written in my own test plan as something I hoped for. You turned it into an instruction to the player.
The optional "have you played Ace Attorney" question too - that separates confused-because-new-to-the-genre from confused-because-unclear. I'd been treating those as one problem.
I'm going to borrow all three ideas. Thank you for leaving it somewhere anyone can read it.