Small demo update

Hi !

I had to change the background music for the demo, sorry for everyone who enjoyed the previous one. I'll give my best to include original music for the full release.

Also I made two small improvements based on your feedback:1) Setting to move the camera with right mouse button

2) Room labels are now fading on high zoom levels

I plan on doing a content update for the demo soon, so stay tuned! :)
- Ahroma