Cool game! I like how you made simple graphics (smaller scope) but still game is enjoyable.
Nice fight design that is not so easy and obvious, throwing grenade is tricky. Love that you can kill yourself (I did with cluster bomb :D). Enemies that are displayed like on radar is cool idea, make it more interesting.
I like how you used light to make effect of appearing next parts of labyrinth, that gives a lot value for game with simple implementation, cool usage!
Upgrade mechanic is cool, that method od using mouse to buy new stuff is pretty and well working, good job!
I had some issues with sound, I did try to volume up on max but still didn't hear anything :(
Good job and congratulations on your submission!