Episode #1 - Mobile fixes

Some features weren't working well on mobile. I spent the day ensuring the gameplay is as enjoyable as it is on desktop.

Here's what I changed:

• Fixed mobile layout issues.
• Styled sliding puzzle success/failure buttons for better UX.
• Adjusted mobile background sizing for improved zoom.
• Fixed peeking back image opacity. You we're not suposed to see the backdrop.
• X-Ray and peeking now reveal the image on mobile; touching to reveal is awkward (your finger blocks the view).

Thanks for playing, and please rate and comment.