The art and special effects were really good! I especially like the camera shake and particles when you destroy something, as Mark Brown would say I really liked the "juice!"
I like how it tells you which movement scheme is happening, it's kind of nice knowing what's going on even if you can't control it.
When the turret malfunctions, it's a little hard! Maybe in the future you could add a line renderer so that it's easier to tell where it's aiming? I dunno, just a thought. :)
Good entry overall! If you don't mind, could you play mine as well? I would really appreciate it :)