Not a bad submission.
I think the gameplay balance needs a bit of looking at to improve on what's here though. The name is Power Shot, and while there is indeed a Power Shot ability, finding the time to use it is a bit difficult. I think there needs to be a bit of balancing between the speed of the enemies and how often they shoot at you to give more opportunities to use the Power Shot ability, or as an alternative, a power up that turns every shot into a Power Shot for a limited time.