Most of the missions are frustrating with at least 2, 3 or 5 minutes to destroy all the enemies with an awful gameplay
well, to upgrade your hero you need to destroy enemies but you can't find enough in order enhace weapons or improve fighting skills
and even worst in some missions you have a big disadvantage an very short time to succesfully protect your allies.
the way you move, fly, fight and the camera doesn't help you at all (even a ps2 game like ''the zone of the enders'' is a lot better with high tech, high speed robot combat action, plus a nice anime story)
just rent it if you are curious...