Good presentation, but gameplay needs polishing.
Those small robots are annoying as hell. Only some moves may target them (and some even cost MP depending on Hero), and they become invulnerable when attacking. Very annoying. >_<
Speaking of MP, I found it strange that Storm's Lighting bolt doesn't cost MP, but her forward dash does.
Some moves are too slow, and you get hit before hitting anything. Particularly Cyclops' kick (F F A).
Also, you could increase the Z-axis attack range, making them hit a wider area: these characters are BIG, it feels weird that you can't hit anything standing *exactly* in front of you.
Offsets need some adjusting.
The play area feels too small, and the ninjas can hit you from outside the screen, with little room to maneuver away from them (and you can't block either). They could be made subject to the screen borders, but I'm not sure this would help. I know it would require you to change almost everything in the game, but it would benefit to increase the screen resolution.
The story looks good, and the cutscenes are amazing (though I found the opening sequence too long). Dialogue seemed forced at times, I couldn't really "hear" them speak, but that may be just me.
And yes, it would be better to have an English version so people feel more motivated to try your game (and play for longer time) and give you better feedback.
Overall, I like the game, so don't take my comments too hard, but it needs polishing. ^^'