Glass Tower Birds

Break tower and save birds!
From the authors of Glass Tower series.

Birds are caged! You must free them breaking blue blocks. But be careful and not break red blocks!

Glass Tower Birds is a game with physical collisions and gravity simulation.
Gameplay seems to be easy at first.
The tower is constructed of blocks which are different in size, shape and color.
Your aim is to break all blue blocks and to save as many red blocks as possible.