This is the weakest version of Cat God in terms of hp, he has only 1 Million hp while maintaining the same knockbacks than his other variants, having 1.4 Million the first one and 1.5 million the second (with every Mystery Mask treasure at 100%). However, this Cat God is more support like oriented, because his main ability is generate a Lvl12 Shockwave that teleports every cat it hits back 1500 range, letting the peons destroy the base or making him advance to destroy the base with his final strike. Cat God attacks by raising his foot before stomping on your units, generating that Warping Shockwave, before swinging his arms to generate lightning strikes, the last one being rainbow compared to his usual blue and white.
Mesocosmocyclones will teleport your cats forward to let Giga-God generate his teleport shockwave and let the peons push to your base, but you can send weak meatshields or anti warp shields to be knocked back instead of being teleported forward by Mesocosmocyclones to avoid generating the shockwave.
Another way to deal with his shockwave is staying near your base, while he teleport some cats, fast meatshields like Manic Mohawk or Manic Eraser can reach Giga-God before he finishes his animation shorty after they leave the base, stalling him pretty succesfully.
Catellite is a good meatshielding option here because of the anti teleport ability, can stall the cyclones for some time for you to think about your next move.
Rush units like Maglev and Awakened Bahamut are pretty effective here, because they will be teleported after dealing some damage and they can attack again once they are teleported back, dealing massive damage to Giga-God in stacks, due to both attacking again once their animation is resseted. At level 40, A. Bahamut will be teleported instead of knocked back, what leads to more than 3 attacks,chipping about 3/10 of his health.
Oho, we meet again! Cat God isn't defeated that easily! Yeah, you've done okay in that last Cosmos chapter, I guess. Maybe you've finally earned the right to be my sidekick...