Launch and Polish Fixes

I launched the game yesterday, but was in too much of a rush to make a dev log post about it. Today however, I did some polish updates:

• Added custom texture to enemy spinners rather than a solid dark grey
• Added intended physics material to enemy spinners
• Added music, complete with a volume slider
• Exit button now completely refreshes the game instead of doing nothing
• All spinners now spin 20% faster (this is a purely visual update)