Updated demo with quality of life changes

Updating the downloadable demo version with some quality of life changes that has come about as the full version has been developed.

These include:

• A pause menu (open using the ESC key) that features ways to go back and forth between levels you've completed.
• Options menu for fullscreen, volume settings and changing keybindings.
• A way to reset saved game data.
• Changes and reworks to some rooms.
• A lot of bug fixes.

___

I wanted to update the web version but some issue with Unity 6 prevented that from happening. I don't think any previous saved data is compatible with this new version.

If you've already played through the previous version, first of all, thank you!

Second, you won't find much new content (10 or so new/updated rooms in total) but the "Full" version is like 99% complete so more content Soon™