A Le'boin spawns at the start at the level, with 20 total Those Guys (10 spawning after 20 seconds600f and 10 more after 6.67 seconds200f later) as peons. Defeat them and you can attack the Enemy Base.
When Enemy Base reaches 99%, the real battle starts. 2 Capies spawn, followed by more Those Guys. After that, Dark Emperor Nyandam appears, with J.K Bun Bun as the boss. 20 Those Guys, 20 Trolly Bloggers and 1 more Capy spawn as support.
Strategy 1 (Uberless)
Even though it may be tempting to bring anti-red units to deal with the Capies, don't. They are very short-ranged and one bad hit can kill your entire stack in one attack.
Start off by stalling the Le'boin until you have max money. Then use Dragons and Parises to kill it. Keep on spawning long-Rangers, but not Bahamut, Ururun nor Catdam.
When the base is hit, Capy spawns. This is when you should summon Bahamut, Ururun, and Catdam. Eventually, Nyandam will spawn. He doesn't do a ton of damage (~15000) so he's not a big threat. Soon, a 1,600,000/37,000 J.K. Bun Bun will spawn. There should be three Capies supporting him. If you have enough Dragons, they should deal tons of damage to Bun Bun, and Catdam can keep the enemies slowed. Once J.K. dies, the battle becomes much easier. Just get rid of the Capies and kill Nyandam.
Strategy 2 (Ft. Uber)
Stall the Le'Boin with Mohawk and Eraser, and save up until you have max worker cat level and money. Then kill the Le'Boin with Paris and Dragon, then spawn iCat, Crazed Fish, Island, Bahamut, and Amaterasu. Continue to spawn your main attackers, and occasionally Doctor, and meatshields, and eventually you will win. If your Bahamut and Amaterasu die, don't panic, just keep going. The main thing again is to kill Bun Bun, once he is dead you're good, and the stage is pretty easy.
Strategy 3 (4 Star)
Lineup: Catburger (30), Gato Amigo (40), Jiangshi Cat (27+7), Sanzo Cat (26+4), Necro-Dancer Cat (27+5), Cameraman Cat (50), Zamboney Cat (30), Prisoner Cat (40), Awakened Mina (30), Awakened Ururun (30)
Cat Cannon: Slow Beam or Normal
Wait for the initial Those Guys to get close to your base, then spawn out a Cameraman to kill them all. Once the second wave of Those Guys appear, do the same for them, then you only have to deal with Le'boin after that, make sure to stall him with meatshields only and get to max money and worker cat before killing the it. Once your at max money and worker, spawn out Awakened Ururun to kill the Le'boin, once it is dead, you can spawn out everything else in your team. Upon hitting the base, the first Capy will not be to much of an issue, use this as a chance to stack up Necro-Dancers and Sanzos, once Nyandam spawn, his attack may kill your Sanzo stack if you push to far, but not your Necro-Dancers, as they have higher range. Once J.K. Bun Bun appears, continually spawn everything in your team, the only way you could lose with this much money at this point would be if Awakened Ururun knockbacked J.K. Bun Bun twice or thrice when he is being slowed or frozen, but that is highly unlikely. If you do start getting low on money later in the fight, prioritizing spawning the units you need out on the field at that specific time, if J.K. Bun Bun is not being slowed, but he is being frozen, then don't spawn any more Sanzos as if he is being permanently frozen, you wouldn't need Sanzos out on the field, same goes for if you have so many Sanzos out on the field, then you won't need anymore Necro-Dancers at that point. Once J.K. Bun Bun goes down, the level is very easy after that as all you have to do is take out Nyandam and the base. Once Nyandam is dead, you have won the level!