The way scores are calculated in PVZ3, from what I understand, is based on how far left the zombie has moved before being killed - the closer it dies to the left side of the lawn, the fewer points you get.
Enter the "Back Biter"-class zombies - the Digger and Volcanologist Zombies. The way they act is identical (moving underneath the lawn and emerging on the left side of the lawn to eat plants while moving left to right).
However, due to how scoring works, killing Diggers and Volcanologists as soon as they emerge on the left isn't optimal at all, due to them being on the left side of the lawn and thus scoring the fewest amount of points possible. This should be reversed, as it does not make sense for you to be rewarded for letting a Digger or Volcanologist move all the way to the right side of the lawn, clearing the whole lane.
What I'm saying is that THE WAY ZOMBIES SCORING WORKS SHOULD BE INVERTED FOR BACK BITERS. If a Digger emerges on the left and you kill it immediately, you should get the maximum amount of points for that kill, similar to killing any other zombie as soon as it appears on the right side of the lawn.
Additionally, I think something that should be added as a potential alternate counter to Back Biters is the Potato Mine and its evolutions (Golden Yukon, Devastater, and Mashed Destruction) - in the first PVZ game, due to being underground, Excavator Zombies would explode when attempting to dig under Potato Mines (due to them also being underground). I think this interaction would be fun to add to PVZ3, giving Potato Mines a bit more of a use in the game (as right now, they're heavily power-crept by Iceberg Lettuce in my opinion).
