The Stage was my absolute hatred ever since I tried playing with my low upgraded Normal cats from the start. King Wahwah is merciful for the small damage he initiates. A total of 24,000 Damage. With useful "Unit Defense UP" Combos, most of my buffed Normal Cats can withstand against his whole attack at ease, and being able to tank more hits against his strong Peons
Here is a Full List of my Cats' Base Health:
• Eraser Cat: Lvl 79 || 22,050 x 1.2 = 26,460
• Macho Legs: Lvl 81 || 29,800 x 1.2 = 35,760
• Lion Cat: Lvl 70 || 34500 × 1.2 = 41,400
• Island Cat: Lvl 87 || 54,250 x 1.2 = 65,100
• King Dragon: Lvl 85 || 34,425 x 1.2 = 41,310
• Jamiera Cat: Lvl 74 || 71,000 x 1.2 = 85,200
• Shadow Gao: Lvl 40 || 125,400 x 1.2 = 150,480
Shadow Gao with two Unit DEF+ combos is able to tank at least 5 times before getting knocked back. Unit DEF+ combos are insanely necessary for units who have massive health so you won't waste its reliability.
With all my normal cats that can finally tank King Wahwah's one attack, the level is pretty easy until the waves of backup peons arrived. Zang Roo and SBK are the main threats as they are able to devour your high cost cats' health and King Wahwah will be able to tear your base. Sniper the Cat is extremely crucial here against the peons so you can reposition your cats to finish them off. The waves have a huge time gap which makes the level no longer difficult after you accumulate lots of money and units.
Talking about Zang Roo, Either let it bury into your backline while the Lion/Island Cats are holding King Wahwah's position so you are able to target the Zombie peon first, do not spawn Jamiera yet, spam deploy King Dragons as many as you can, and then deploy a Shadow Gao when both Scissoroo and revived Zang Roo are near the base. If you chose to avoid Zang Roo to bury, let Sniper the Cat to attack it. It is risky as King Wahwah will knock back the entire frontline and Zang Roo will continue melt the units. In this situation, do not deploy any units until zang roo is close to the base, deploy King Dragon, Macho Legs, and Island so you can take down Scissoroo next.
After you cleared the wave of two threats, At least knock back King Wahwah at the middle of the range. That is the time where a wave of Dark Doges and Shadow Boxer K will spawn, Shadow Gao is killed that time. Deploy every Normals except Lion and Jamiera Cats, you want to save up your money for it because the buffed Shadow Boxer K is too annoying to deal with when more Dark Doges are spawning, immediately use Slow Beam. It takes even longer time to finish off Shadow boxer K, with that done, the level is now at normal difficulty, as Dark Doges will spawn the entire time, you can Finish King Wahwah with all the Cat units. You are then rewarded a powerful Glass Cat(Metal) that slows Traitless.