Start Survival as often until you get the waste laboratory level. Then run to the left end and jump onto the crates. There only a few enemys will able to hit you (drones/soldiers and sometimes beans). Normally, the most will go to the beginning of the crates and stop there. Then use Gaus, Grenade Launcher or whatever you want to kill a mass of enemys
Tip for later days: First only take the orders. If you take orders immeadeantly, you will get 100% Waiting Rating, same how long they have to wait for their Pizzas XD
I ned two days to completely understand the controls, somewhere around aday 7 i known ALL functions in the game.
On day 17 i know, what things annoy the customers ^^
You can't know everything from the beginning, even with tutorial...
 "Kongai"){kind=icon}
 "Feudalism II"){kind=icon}
 "Chronotron"){kind=icon}
 "Thing-Thing Arena 2"){kind=icon}
 "Gamma Bros"){kind=tracking}
 "Ring Pass Not"){kind=icon}
 "Nodes"){kind=icon}
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 "Micro Olympics"){kind=icon}
 "Speck Oppression"){kind=icon}
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 "Papa's Pizzeria"){kind=icon}
 "Sprout"){kind=icon}
 "Scribble!"){kind=icon}