After hitting the enemies base, 2 Jackie Pengs will appear as a main threat.
For chapter 1 - Start the battle by upgrading your Cat Wallet to max level, then spawn few meatshields and your Axe Cat . Save your money for Bird Cat and for Cow Cat. When Jackie Peng spawns, keep spamming your meatshields, Axe Cats and spawn few Gross Cats . When Bird Cat dies, immediately spawn another one.
Note - You will need "Energy Drink" treasure, otherwise you won't be able to spawn your cats fast enough. Making this stage more difficult.
For Chapter 2,3 - No particular strategy is needed. Just use your basic cats.