The developer abandoned shortly after release and never released additional content, which I honestly have to say I could have lived with. But worse they left the game in a pretty broken state, some gameplay mechanics are heavily bugged, like zombies not being able to be shot if they are on uneven terrain.

The price is honestly insanely insulting. 25€ for a bugged, abandoned indie game... only some developers can afford being that confident in their product and this is not one of them.