I can't really recommend the game as is, but I'm under the impression that the problem I'm having will be corrected in the future. Time of writing is July 7th 2014, if there have been any patches since then, this review might not be accurate.
So this game is not bad, let's be clear: I simply am not recommending it. The system seems unpolished: The bounding box, timing, and rules for what bullets collide with what object just don't have the professional intuitive shine that say, Deathsmiles has. I know I'm comparing a company team to an indie developer, but that doesn't make the problems any less noticeable. Other problems: enemy ships can do things you cannot when you possess them (most egregiously: turning around and shooting the other way), and the teleporting beam trajectory could be better (as is it's rather awkward; also it has a charge up time which has absolutely no user feedback).
But this game has a story focus! Pretty rare for this type of game. If the gameplay is just average, how is the story? I'd like to know, too. Thoughout the game you get snippets of story, and it creates a very interesting experience... but I personally think the novelty of the gameplay has an expiration far shorter than the time it would require to go through the game twice (to collect all the snippets of story). However, I never actually finished this game, so I don't know how the story concludes. The difficulty for the entire game is, despite the problems named above, quite easy. Dying is infrequent for those experienced with this genre, and there are no difficulty settings to adjust. The boss fights, once you figure out how to win, are also not hard at all. Then you get to the end of the second to last wave and find that it is near impossible. Brick wall. Not many players will proceed past this point.
I might have kept trying if I could actually get to that segment again quickly. But since it's at the end of the wave, you need to replay the entire wave first. Takes about 5 minutes, and it's patronizingly easy the entire time. Imagine taking a math test and every time you made a mistake on a really hard problem, before trying again you are forced to first to solve 50 basic addition problems (2+3=?). I've poured quite a bit of time in this last wave alone, and I can no longer justify repeating the patronizingly-easy-5-minutes-snooze-fest even one more time just to retry a 10 second difficult segment.
Despite my rant, I'd say those who love this genre should pick it up next sale. But even if I didn't have any trouble completing it, I still feel that this game is a one-and-done deal; you'll play it, you might enjoy it, but once you uninstall it you probably won't be revisiting it.