These enemies are no joke, despite what it may look like. Each is insanely buffed, to the point where even the strongest units for Traitless foes will need multiple attacks to take out the boss and even his supporters. Luckily, all enemies keep their awfully short ranges. Bring area attackers. You have to kill the peons first so your meatshields can stall the boss. It will help a lot to mostly use cheap meatshields if you can, but still use Manic Eraser Cat for its speed and health. Money is quite tight here, as the peons don't drop a lot of cash.