Its a very easy setup, so i recomend a nice cybergrind customization pass for whatever you wanna look at for a solid hour.
When you are happy with it, go to patterns and open the editor.
Just make every single tile -10
Export and refresh, then select only that pattern.
Jump in and begin practice, nothing will spawn and you get roughly 1k points for 100 waves.
When you are done, jump into the abyss and cash out, make them guns purty.
That simple, have fun