At first glance, it seems like just another generic top-down shooter; but the way you've executed a lot of the gameplay elements is fantastic.
Its challenging enough to keep a player engaged; but not fully immersed. I think the lack of music is something that took some potential fun away. The eerie sound effect made by the dark red monstor (the one with the horns and sharp teeth) could make for some terrific thriller music if implemented.
Aside from that, everything was amazing considering the small time frame we all got to make our games.
Cheers!