Pretty fun, although I'm not entirely sure what the health did: when I lost a life, I got sent back somewhere, but not to the start, and not to a place that I had, when getting there for the first time, expected it to do anything special. And if I respawned and there were several zombies blocking the "exit" towards the space where I had to collect syringes, that made it sorta hard to get out and reach them. Maybe the positions of non-dead zombies could have been reset when the player respawns. I could also have wanted some music and sound effects, but I guess it was hard to fit the time for that into the one week you had to make the game. And the pixel art was nice, although the player's gun looked a bit weird.