I like when it's a horde of zombies to run from!  Good job~ work on it some more if you have the motivation after the jam.  I'd suggest playing with particle systems so when they die it's more satisfying with an effect of some sort~  Please check out my entry if you have time.

The limitations on aiming actually add quite a bit of depth to the game. I felt like I was constantly needing to shuffle around to face enemies. It would be interesting if some enemies tried to make sure that they only attacked you from above and below to dive into the mechanic. On a bit of a side note, the text is a bit blurry. One thing I highly recommend is using text mesh pro. Interesting game though!

I like the concept! I would say that it is a little frustrating when you have 4 HP left and one enemy left on the screen and you can't take them out. Maybe having some other way to generate health, maybe over time or some location on the map that spawns health every few seconds.

Fun game overall. The multitasking feeling of shooting and running around collecting health is really tense and dynamic.
Big problem tho in my opinion: each zombie takes two hits to kill, and each life drop gives one life back. which means, it's not really and "infinite" game, as you eventually will die even if you take 0 hits. Maybe the health pickups should heal for two, and then you can stay alive for as long as you take no hits.

This game was fun and simple. I like the concept of ammo and health fused.