Atmospheric Absorber

This secret upgrade will suck up clouds to restore your shields by a significant amount. It is the most consistent upgrade in the game for restoring your shields.

Tips:  
 * 1) Try to absorb as many clouds at the same time as possible. You can achieve an incredible regeneration rate with enough clouds around
 * 2) Don't destroy cloud traps. You can use them to heal as much as you want.
 * 3) Clouds vanish as you suck them up.

This upgrade is a special reward for players who have supported the creator of the game by buying his book.