I finished the game with 0 people saved, 0 sacrifices made and 0 deaths. The game is fun, but the 'follower' part doesn't work in its current state. It falls on the same pitfalls that most games with escort missions do (GTA IV for example). For that I have some suggestions:
A) Make the AI have some kind of survival instinct and actively try to stay away from danger and hide behind the player (too hard and unnecessary for a jam game in my opinion).
B) Implement a "Stay here!" command to make the follower sit in place until the player cleans the enemies ahead and comes back to pick them up later (might not be very engaging for the player).
C) Make the follower invincible (this is the one I would personally go with).
Other than that, the game feels great to play. Shooting down zombies never got old for me.