Under rating threshold (hideshow)
My take: A nice little 'space invaders knockoff'. While it doesn't bring anything new to the gameplay table, it does have time-wasting entertainment potential with a little tweaking. Some things to consider: 1) Show the tanks armor/hp. 2) Reset the tanks armor/hp every stage, unless you have store. 3) Consider making an upgrade store. 4) Alien ships drop temporary bonus/repair upgrades upon their destruction.