Well for me, you should do a new case but with the same characters, the idea is really good and characters appreciable, but if you just do the 7 murderer part that will be too obvious, so yeah I would be so happy with a totaly new case ! :D
This first part was more to introduce the characters / setting / plot / etc. My plans for the next parts would be less straight forward of who-done-it and instead explore what will happen as the timeline starts fracturing. More puzzles with time elements versus the questioning suspects over again. I just wanted to test the waters and see if this case was interesting enough to proceed. =) Also I would love a review! If you have somewhere in mind you would like to post that just send me the link, or if you wanted you could post one here and use the spoiler feature to hide the solution from new players =) Thank you!