I think that he game would benefit greatly from some better feedback. If the enemies would have a stutter animation or slow for a bit and flash after being hit. I would like the gun sounds to be a bit more beefy so that I feel like I am doing something special, I like having a Dirty Hairy kind of feel when I am in an FPS. The games pacing seems a bit fast as well. A slower start to allow me a bit of exploring with turret placement would be very nice. You got a lot done for the Jam. The game works. These are just some personal observations that I think would take your game to the next level. Great Job.