(Thank you for the volume warning, cause hot dang that was loud).
I really like the core idea here, needs polish of course but the constantly switching play areas were implemented well and I liked seeing the enemy spawn areas moving around. I did feel like the aiming wasn't as tight as it needs to be for a game like this, I think having an in-game laser sight/reticle to show where the character is aiming and where the bullets will hit would go a long way in making this feel nicer to control.
Well done.