This is a big update. Changes:

1. Refactored most of code.  It's now cleaner and simpler to read.

2. Added music and audio mixer. Now you can configure volume of game sounds and music separately or mute them.

3. Added handy palette. It allows you to simply sort, select and draw any available tile.

4. Added decorative tiles. They do nothing but change own color when ball comes across.

5. Added text tool. Captions now can be added directly on the map, so you could leave some messages to other players.

6. More demo maps. On first run you will see a tutorial.

...and something else I forgot to mention.