Large update today. Now at v1.6
Changed zombie movement to avoid orbiting. Essentially zombies walk directly as you instead of accelerating to your location. This fixes the game breaking strategy of orbiting zombies around so they can't hit you.
Lowered the initial wall count on the original level to encourage independent base building.
Lowered the firing rate to encourage building walls instead of run&gun
Added an automatic Wave countdown to balance that I also added slow HP Regen for the player.
Walls are much more durable, again, to encourage using them.
Known issues:
Sometimes zombies can glitch through corners of a wall. I think this is because the zombies behind them are pushing them into a solid and teleport through it, and I'm working towards fixing this.
Zombie hordes result in zombie movement glitches. Like the wall glitch, I think this is because zombies are being pushed into each other. To help somewhat I've caused this to slow the zombie, benefiting the player and also preventing large hordes from forming.
If you press F at exactly 1 second on the countdown timer, I think a double round can start. I'll be fixing this shortly.