Hi thanks for the feedback and tips on how others can get it to run properly.
No, I just did all the code. I use the lowpoly town pack by Synty studios for all my jams now because I suck at graphics and modeling. Because of the theme, I splurged and also bought their zombie pack as well. Weapons and barriers were free assets from unity assert store and sound fx were either free assets from assets store or cc0 sound effects I got from sound.org
A few animations were from mixamo, but I also experimented with animation rigging to adjust the basic idle animation for holding gun, aiming, and reloading at run time.