Cash is awarded whenever an enemy unit or building is destroyed. You can also earn Cash by trading in Prisms via the Store. Cash can be used between campaign levels to tweak and improve Colossatron for upcoming battles.

Primary uses include:

• Repairing Colossatron
• Purchasing additional Powercores
• Purchasing power-ups (Mega Bombs, Shields & Rapid Fire)
• Reconfiguring Colossatron between levels