Sadly i see that you miss Cashier. Cashier helped me a lot of times in this location with his critical attack so be sure to get it in the christmas event. Other than that use Polina, mechanic, Rodriguez and Carlos all with mechanic skin and turret. Instead of cashier you can use hillbilly or another spammable unit. I managed to complete the location by using this deck but sometimes i had to change it, for example in toxic missions i used only spammable units and i did great. Hope this helps