I have finally found time to complete the last parts of the game.  The version is a release candidate!!!

Whats new:

• Game end with a tree of wisdom, which teaches you how to save the world from pollution
• Composed Music Themes
• Tool-tips system for in-game help
• UI updates for icons, menus and texts
• Game balancing and game difficulty
• Feature graphic for the main screen
• Multiple bug fixes

To play the game download it from here or from Google Play.