Strategy 1 (ft. Kubilan Pasalan)
Also use Warlock and Pierre if you have it (it just takes longer without it).
Stall the peons for a short while to upgrade wallet and fill to capacity. Then, spawn Bahamut and Kubilan and send in the meatshields. When all of the Unicycle Cats appear, use the cannon to synchronize their attacks. This will make them deal less damage. Spawn everything you have, and stop spawning the anti-reds when One Horn is defeated. Kubilan will push all the enemies back if well protected, and you should be able to defeat this level without needing to kill the main bosses.
Lineup: Any 5 meatshields that cost less than 150¢, Crazed Bahamut Cat. Use Cat CPU.
Start: Let the peons or starting enemies attack your base until your wallet is max and full, now spawn all meatshields and Bahamut.
After attacking base: Unicycles appear. Continue spawning meatshields. Let them stack first and fire the cannon, turn on Cat CPU, watch. (Make sure that if Bahamut attacks them, they are still stacked)
NOTE: There may be a chance to let Bahamut knock them back to the base and Bahamut will just wreck the base. Easy win.