Improvements and polish! :)

You can now select which pieces to put on the board in addition to all other control options.

Changed colors to have better contrast throughout the game.

Removed menu clutter. Removed a couple of non essential menus.

Rewritten the rules section to include more information and be easier to understand.

Fixed a couple of small UI bugs.

Fixed a bug which caused the level finished style to not be applied in certain cases.

UI now shows which levels are started but not finished. 

Changed the style of finished levels to have better contrast.

Fixed an issue which caused some animations to be longer than intended when having higher FPS.

Fixed an issue which caused the game to run on 30FPS by default on some devices.

Other minor changes