At the start, a big group of beefy Those Guys appears. After that, a J.K Bun Bun at 200% magnification joins the battleground. Prepare for that, considering that very strong Ginger Snache will follow up very soon.
This stage has a very tight enemy limit. Right at the beginning, the limit will be filled with Those Guys, and J.K Bun Bun will be queued up along with support Shy Boys. This means that the first time one of Those Guys falls, the bosses will suddenly begin to be released. Even at 2400% strength magnification, they don't have much health, so consider entering the stage with a Rich Cat powerup, or using your base to hold off Those Guys to save cash.
The biggest danger in this stage is not the Red Cyclone or J.K Bun Bun, but rather their boss shockwaves. As the two can spawn in quick succession of one another, you run the very real risk of all your heavy hitters landing behind the Cat Base and being unable to reach the front line in time. To get around this, don't release any important units until after J.K Bun Bun spawns, and save your Cat Cannon to stall for time immediately after Red Cyclone's boss shockwave.