Nice game, I felt that the game was most interesting during the boss fight since normal enemies are too easy to clean and they end up being an annoyance more than a threat, I feelt that most of the time the camera is too close to the action since I'm shooting stuff off screen, also I'm not sure about the RPG stat would fit this kind of game in the long run since is more about dodging projectile than tank hits, I would rather prefer become more powerful with visual than statistical.
As the plot, well i guess is doing his job to deliver the best "cute girls shoot each other" experience ever.