in the beginning of this game i thought it was going to be horrible because i don't like these kind of games usually (they need to have action =D) but this was enterprisingly good 4/5
oh and he did put some ideas of his own in it there's 2 player, a bonus round, you can replay levels, the defense wave thing, and you can shoot a lot more bullets from every angle.
first i don't think this copied frantic because frantic wasn't original there were games like this way before frantic remember old space invader? that was the original so if you want originality play that!
there are glitches i found one on level 45 when you start press up and then go left without letting go of the button and you should pop threw the floor and get to the top