Pretty nice take on the arena shooter. Felt really interesting scavenging for weapons. It's just a bit sad that the only really successful strategy in the last two levels is to just run, so it would maybe help to decrease enemy count a little. Also the fact that you hooked level completion to a time limit felt a bit unnatural. Maybe it would help if you stop spawning enemies after the time limit, but triggered level completion only once all enemies are defeated. Else the game will just cut off in the middle of the action. But overall really cool concept and execution!