I like the overall idea and gameplay. Clearing hordes of Mobs/Zombies felt kinda satisfying.
Losing health over time, unless you find medicine, makes for a fast pace. Although I didn't like *how* fast. It was a huge trial and error from the first stage and only got harder.
The problem (to my understanding) is, either you run out of HP too fast and can't clear out the hordes quick enough to collect them
or
the way the health drops makes it necessary to run into a big horde and die most of the times, as the wave clear on mouse 2 comes with a huge downside and doesn't clear enough unless you are in those open areas. I liked the over the top Animations and Sounds although they where quite a bit of ear torture because how loud they where, at least on my Headphones.