Mini Update 1.8 - Volume Control and other small changes

Mini Update 1.8

• Added a volume control point, accessible from the Esc-menu.
• Changed the way to progress in the 2nd invocation, making sure players reach the necessary solution. (This cryptic description is to avoid spoilers for new players.) This particular issue has been a leftover flaw that derived from an old game design idea that we eventually threw away and we really felt like finally adjusting this.
• Fixed some minor typos.
• Preparing for v2.0