I solved the mystery after using only 1 hint! The text solving system is great and when you input the wrong answer it actually tells you why instead of just saying wrong. I liked that you could zoom and inspect the scene entirely. It wasn't intuitive that right click zoomed out, maybe adding escape to do it as well would help. Overall I liked the difficulty and solving it felt good. Look forward to more mysteries!

Got through the demo pretty quickly and didn't notice any bugs.

• Whenever possible, I feel like it would be better for the player to give responses by interacting with the diorama instead of text input (such selecting what object was used for a crime rather than typing its name in the response box)
• bare bones diorama was good for the demo, but having very few objects and red herrings scattered about made the mystery pretty straightforward.
•  instantly zooming in/out when selecting an object felt a little sudden
• Camera controls were fine for the demo, but I wonder if it may become an issue with a larger, more complex diorama with multiple rooms. If something like that were to exist, I think I'd rather move the camera  more like a first-person game with noclip.

Seems like a promising demo with a lot of room for development