Hello! And apologies for the delayed reply.
I'm so happy to hear you played this and had a good time! I definitely think a big part of the fun is the fairly simple rules and getting to play at snooping round and investigating things.
You're right that 4 pieces of evidence is probably a bit much for a single session game, I'll have a look at adding/amending that when I revise a few things.
Thank you for your feedback!