in my experience it was very hard to play but im not sure if i just suck at shooters. my main isssue was that i sometimes would randomly die when zombies were nowhere near me. also, reloading is quite annoying since you have to drag them into place, and they also have physics which makes it harder since they sometimes fly away when you try to put them in. they should just let you click them to put it in the first available area (the first empty one in order of shooting). about everything else, the art, audio, and narrative are good, and the game itself has pretty unique ideas. only thing i can complain about is enjoyment, mostly the reloading process.
and someone already mentioned it but the numbers on crates are misleading at first. shot all of my bullets at a crate cause i thought i needed to hit it 7 times to get bullets.