People complaining about the Bat-gang, when actually it's the better non-passive upgrade, along with the single bats.
People! Aim to the gray parts in the first bar of the kicker, not the blue part, you'll get an horizontal shot. The Bat-gang will do the rest for you. ;) Oh, and in the Critter's upgrades menu, you can also reset your upgrades (reset button), and use them as you want.
 "Kick The Critter"){kind=icon}
 "Burrito Bison Revenge"){kind=icon}