Shambling Along (Insane) is the second stage in Zombie Awakens!.
Squire Rel appears as a peon.
Groups of Skelecats appear as a constant threat. The longer the battle goes on, the higher their strength will become, peaking at 600% after 266.7 seconds.
This stage is pretty straightforward, but you'll need to have a lot of Area Attackers. You'll need at least 3 meatshields here: Mohawk Cat, Eraser Cat and Crazed Wall Cat. The reason for this is that you'll face a Skelecat horde and you need to fight your way through.
First, after a few seconds a Skelecat will spawn along with some Squire Rels. Stall him with one meatshield until you're able to spawn Crazed Bahamut Cat. By this point the horde has already shown itself, so you'll need to build up Area Attackers while maintaining a good meatshield spam.
If you have Ururun Wolf, she will help a lot in ensuring that the Skelecats won't get close to your attackers.
Once you get to the enemy base, it will only take a few seconds for your cats to destroy it since it only has 150,000 health.
The first will spawn, you have to get your money at least to 2000¢ before you start spawning your cats. When the Skelecat is two-thirds of the way to the Cat Base, start spamming your meatshields along with Parises and Crazed UFOs. By the time you kill the Skelecat, a horde of them will come out. Spawn your Parises, Crazed UFOs, Flying Cats and Area Attackers now; you will gain money quickly. Spawn in Bahamut with all the other cats. You've pretty much won now.