Artstyle is pretty much the same and the both games are about zombies. I havent played it yet, but i will do it now.
-FP
Didn't know about that game, thanks. I've loved that one so far as well, sadly the dev have stopped making these games, but luckly he uploaded an uncensored version of the game for everyone to play.
Looks like Siren's Zombie's Retreat is almost 1 to 1 copy of Nergal's A Zombie's Life, I'm pretty sure he has mentioned it somewhere before.