Demo update and music changes

This new version has a few bugs fixed, a bit of level tweaking, and some music changes. I will be changing the boss music a little to make the audio glitches be fixed, and there is still a bug where respawning may cause music to stop. Should have this fixed in the coming days. Will be notifying the Kickstarter backers of the update. You can get a physical copy reserved here http://kck.st/3oDbuK1