Pixtiles - Continued development

Pixtiles was originally a jam game for GMTK 2024. I've updated it with these changes:

• The player can now pick which color to place with a mouse click (scroll wheel cycles through them)
• A 'done' button activates when you've placed all the colors, and will fill in the puzzle with empties to solve it
• Options page added, includes volume sliders and fullscreen toggle
• If you failed to complete the puzzle, the incorrect spaces are highlighted on the board