This game was fun! It took a while for me to get used to the mechanics of guiding the group but once you get the hang of it, I wanted to see what I can do with the group and the weapons. I felt the projectile weapons really had no benefit since it is relying on luck and timing. maybe if they shot out to form a small bullet hell, perhaps? Maybe more melee weapons like the sword would have been interesting. It would be great to change the rotation direction in case you find yourself in a weird predicament and perhaps do a little bit of sword play when toggling directions.
I would suggest maybe that some pick-up zombies may have certain attributes to enhance in attacks and movement? It could make the gameplay a bit more interesting.
Great work!