Tips from my experience playing this. Right now I'm wave 58 casual.
Use casual mode if you need to rack up medals. It helps to have a full party with lots of different party skills, for instance rogue for active, hunter for engineer or little girl for leadership. You should get a full party (4 people) by wave twenty or it's fail. I suggest 30 chickens by the time you get the second house and then by them slowly until you have 120. Try to find your party members good weapons like laser pistols or rapid bowguns which have lots of mod slots. A weapon with 4-6 mod slots is very good. Put good level 3 mods on the first slots then when you reforge put a junk mod on the weapon then reforge, so you don't lose your level 3 mods. My suggested class is rogue for the money each critical kill.
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