With an wonderfully laid out and easy to read format, this seems like a super fun solo game I’m definitely gonna check out soon. I love the use of time and the last digit being even or odd to add an extra layer of randomness to the game.
Your art in this game is amazing as well, and the guests all feel like they could have a lot of life in each play through. Just on a initial read through I think I’d want to change ‘The Plus-One’ to make it so your lover can only be marked if you yourself become marked and they are still alive, as otherwise the odds of your lover dying seems extremely slim.
As an added set up suggestion, instead of saying just two D6, I’d have a suggested optional supply of 12 different colored D6, and assign a color to each guest so rolling for marked and death is a much faster process. Rolling a bunch of die at the same time is fun anyways, and thematically I can see it feeling very fun to see the results all pop up in one go. ( Also I think it would be really cool to have a highly unlikely but hilarious result note that in the unlikely event that if all surviving guests roll when no one is marked and all results are the same that the killer wipes the entire party out and a separate Curtain Call for that, but it does break up the 6 results format.)
Over all, this looks like a super fun whodunit and I definitely wanna give it a try. Will hopefully come back and write up a report if I get time to try!