This was a fun start! I felt like I missed any clues as to whose blood it might be, and ended up just guessing. If you add more rounds, you might look into making it less of a guessing game (or maybe it’s really obvious to everyone else and it was just me who felt this way–wouldn’t be the first time!). Also, as you say–four hours is four hours. :)
On a more minor note, I almost missed the bolded link-reveal links because they were the same colour as the regular text. Adding something other than bolding to make it clear that they’re links might help other players.