Interesting game ! Good job.
Here are my tips if you want to further improve it:
I felt a bit too guided by having all the clues marked on screen, i think it would have felt better to instead show a marker on the magnifying glass when we are hovering a clue.
The evidence mechanic was great, grouping evidence to solve the case, but a lot of time i found myself putting random things until it does something, so a simple fix would be to not show when an evidence is in that "group", but instead show the "group score" when all evidences are placed. Its just an idea but i think it would have felt better.
Now, as i said it was a very interesting game, but there was a big flaw that ruined the immersion in my opinion. There is only 2 supects, and the game already tell you its not Tony at the start of the game, i would have prefered 3 suspects and really don't knowing who did it at the start.
Other than that i liked pretty much everything, good job. The art was impressive too !