You are dead, congratulations!
A bit rough around the edges but given the short time, it's understandable! I liked the game, reminded me a bit of some old DOS shooter I was playing called Bio Menace.
So I got confused on floor 1 - collected the cog, saw cogs 1/3 and thought I had to go back to the beginning but couldn't jump back up. Then I read the description that said there's 3 cogs overall, not 3 cogs per floor :D I got kind of swamped on floor 2, zombies didn't seem to stop coming so I got stuck there