I feel unqualified to review this game, so I won't contribute a star rating. A lot of it seems great in concept, like the combo and level up system, but they feel like elements that only can really shine if you dedicate yourself to learning, solving, and memorizing the ideal patterns of enemies to kill. Otherwise, it seems like your weapons would be severely underpowered for the rest of the game. With the story mode and save file features, it transparently feels like the player can elect to replace that skill barrier with raw persistence. Even with that handicap, I could only eke out a victory on all six stages after maxing out all my weapons AND bumping the difficulty down to easy.
The story. Uh. Between the compounding obfuscation of cultural differences, nonlinear storytelling, sci-fi philosophy, and a terrible translation, I don't think there's enough left comprehensible enough for me to give an opinion on. Remarkably bleak for both the gameplay and aesthetic genre used.

I'm a bit torn on this game.
The gameplay is really fun, and I really like the amount of options you have in combat. The story was also interesting, though it admittedly isn't developed as much as the rest of the game, in spite of its intriguing premise.
The thing is... to beat Story Mode, you pretty much have to play through the game multiple times, to slowly but surely, level up your weapons and gain more lives.
While I did just that until I beat it, it got super tiring playing the same levels over and over again just to potentially get to a new stage, and then die soon after and having to do everything all over again.
I still liked the game, but I can't say I loved it.