The latest update for They Are Billions adds waypoints, new housing styles, and towers out in the map that can be repaired. It also adds a bunch more languages and some new music for when the zombie hordes come knocking, but the waypoints are especially nice, letting players make more complex patrol routes.
It’s such a fun game. My only quibble at this point is that it seems to me nearly impossible to win the final wave without being really cheesy with walls and more gaming the game than playing it.
More like you beat the game, not the Zombies, if that makes sense.