A tight portal submission
Congratulations of frontpage! It's a pretty well thought out game. I have a few suggestions for your future endeavors (or this one, if you choose to edit it a little).
Some of the weapons were glitchy in that you could start firing (and expend ammo) but you wouldn't be actually firing bullets to kill the enemy. The AK and M4 were notably guilty of that.
Add some music, or at least the option to have music playing or not. Music adds so much to a game, even if it's fairly simple, atmospheric fare.
The weapons were kind of unbalanced. The magnum and chainsaw were too powerful and you got them too early. It would've made more sense to have the less useful weapons like the shotguns unlock sooner than ones that were useful the whole way through.
Finally, it would be a nice option to set the number of days you wish to play for, including an option that will never end.
Anyway, fantastic submission. I enjoyed playing it. I hope to see more of your work grace the portal.