This is a good entry!
The only thing that bothered me was that the ending came very aprupt. I was expecting an endless top down pve with stronger and stronger waves and suddenly I win out of nowhere :S
I love how you are able to lose the weapons and have to collect them again to survive. That's a very great interpretation of the theme.
The enemies being designed to steal your weapons fits well with the overall concept and the fact that you managed to create different enemy types in such a small time period is impressive.