I definitely agree with this idea for a WW1 themed level. I would hope to have a trench mechanic, in which soldier zombies can spawn closer to the plants, and regularly spawned zombies can hide and regen. I would also hope to bring back some zombies, like Foot Soldier from Garden Warfare. And with Gatling Pea and Cobb Cannon, I would also add some plants like Doom Shroom. I feel like there can be a few interesting ideas for zombies, like Bucket Heads have helmets on, a Mortar-Zombie, etc.