all you do is put skill points into random accesory, then element, then w/e you want and then restart every level until you get an angel doll at the start, preferbly 2, 2-3 angel dolls on wealth towers, you should be fine with 3 level 5 wealth towers early, then start massing machine guns, and other guns, near wave 55-75 mass level 3 plant bombs, instant death, and teleports. i managed to beat it this way
man getting the impossible badge is beyond annoying. only managed to do the easy and medium stacks so far, dumb waitress's arm level making my timer go too high on tricky stacks