I cleared the story mode on v070, and found it really engaging from beginning to end. The cut-scenes really adds immersion and the programming is flawless. Also the art and animations are very nice. There are a few points that I think may make the game a bit better:
Sound effects: Would make feedback easier to receive, because my eyes are not always looking at the shield of the character, for example.
Screen flow: I think that after a level is completed, level screen should show (the animation is great!) and the upgrade screen too.
Last level: It was too long for my taste, and a bit frustrating. I had to retry more than a dozen of times. The reward was totally rewarding though! The design of the boss needs a bit more polish to match the rest of the game, and it looks strange that it does not start from the edge of my screen (bug?).
Speed upgrades: They are a bit confusing at the beginning, and I am not totally sure if those are "upgrades", because going too fast also makes the game very difficult, so at some point they turn into... downgrades?
I hope any of these points help the talent behind the game. Keep up the good work!