Post-Jam Updates

I'm pushing up a couple changes I wanted to get in before forking this project off and making a "post-jam" version that expands on the core game ("game"?) and adds additional features.

The changes in these builds are:

• Fixed issue with cursor visibility when alt-tabbing
• Added a page with credits/licensing information (main menu -> credits)
• Mute audio when game is paused

Thanks to everyone who downloaded!

- A