Gratuitous Zombie Cannon

A dual stage survival FPS/Defense/strategy zombie game a DSSFPSDSZG you could say...¯\_(ツ)_/¯ Stage 1 (Birds-eye-view strategy): Place defense mechanisms such as turrets, mines, etc around you and last as long as you can against the zombie swarm! Stage 2 (FPS): Shoot incendiary rounds at the zombies from your powerful cannon. In summary, there are a bunch of zombies and cannons. So, shoot the zombies with the cannons. You could say the gore, the cannons, the zombies, and this entire game are all...