This level is very easy with fast attackers. Take cheap and fast cats: Lion, Manic Lion, Manic Wall, Express Cat, and Awakened Bahamut are good candidates. Spam Lions immediately as you save up for Awakened Bahamut. Then send Manic Walls and lions until the base is destroyed. Tackey will shoot over the heads of your attackers, and they should be able to destroy the base quickly.
It is possible to cheese this level. It`s difficult without high leveled cats but still possible.
Power-ups: Rich cat is recommended but this is possible without it.
Start the battle. Spawn few C. walls and 1 C. giraffe cat to stall enemy walls. When you have enough money immediately spawn A. Bahamut. After him spawn Jamiera and C. Titan. Spam everything expect combo cats and you`ll win.