0.4 Update

Changelog for 0.4 Update:

- Added temporary models for most instruments
- Added sound effect on door
- Added horn sounds
- Made the incorrect sound quieter
- Changed red books to fall out of the bookshelf
- Instrument sounds now play immediately when key is pressed
- Music now stays lit up when the correct instrument has successfully played it
- Added a clock above the door that minorly indicates how much time has passed
- Added an options menu (resolution and window options currently disabled)
- Added credits
- Changed font in most places

If you give the game a go feel free to give me feedback either via the comments or email me.