Love this, it's got a "Shaun of the Dead" sort of charm to it. Plus, the gameplay loop where you barely survive a difficult battle, and then spend a brief cooldown period cleaning up the scraps and salvaging whatever you can, is a tried and tested one and this game pulls it off simply quite well. The immersion was broken a bit by the audio being too repetitive - even some minor random pitch changes on often-repeating sound effects like the footsteps would help.
Overall, great job!