There's a time delay after you click before you actually start shooting which makes this feel a bit frustrating to play.
Other than that, this is a cool idea, especially with getting to play as the enemy (though you seem to have less maneuverability than the enemy you fight as the player?) I like the enemy logic to dodge bullets and the various maps are cool with their own unique gimmicks. Just remove that shooting delay and I think this could be a lot more fun