It's actually quite good :D No really, I loved the setting and I loved the way you sketched Gamma (mostly), you did really manage to capture his essence.
Now, no story is without fault (mine isn't either, feel free to comment any way you'd like).

While you did portray Gamma almost correctly, you had him go wildly out of character not once, not twice but three times. Three times (possibly even more?) he had the opportunity to take care of Dozer, but instead he slowed down as "he was in no haste to eliminate his struggling foe", or he pulled the old generic bad guy trick of monologueing before killing his opponent (which he did twice). While I can certainly understand that you did so to tune him down and to give Urako more of a chance without making the fight onesided, I just feel as if I need to clarify that Gamma does not hesitate to grab an opportunity as soon as it arises. If he could shoot you in the back of the head, he would do so immediately without any prior talking. (Hey it's no problem man, that happens and there's no way to get someone else's char a 100% right. Surely I made some discrepancies with Dozer as well ^^)

You did manage to get the hand to hand fighting largely correct, good job there ^^. Gamma's "Personal Defence" is largely superior to most fighting styles, but relies on the prediction of your opponent's moves. According to your profile, Dozer fights with an improvised fighting style which makes him considerably less predictable, which in turn should lead to a stalemate in most hand-to-hand confrontations, though Gamma will always pertain the advantage when defending rather than attacking.

Other than that just a few nitpicks to be honest. He's a master of stealth, so he wouldn't need to have his ACU active all the time to remain out of Dozer's sight, ESPECIALLY during night time. For the rest, Gamma's suit provides decent protection against blunt force, which is practically what your kinetic charges apply to their opponents. Blunt force is impact, so if a charge hit him and it would send him flying against a wall, that would certainly be many times less bothersome than it would be if he were not wearing the suit. (This is because of the suit's dense layout, it dampens most impacts before it can reach his body). Ofcourse, if the suit's pierced that's a whole different story.

Welp, but that doesn't take away from the quality of your story ^^. Lots of action, good portrayal of Gamma all around (his dialogue and tricks were honestly better than I felt I did in my own battle, I can't help but feel as if we gave each other's fighters more personality than we did to our own ~_~). Setting was nice too, lots of playground and variation in scenery all around.
I did especially like the underwater sequence :) That did inspire me for a possible battle-scenario I could pull off with a few characters.

I did notice a lack of words, a typo or a double-written sequence here and there (like : "he him in the head with a staff" where it should obviously say "he HIT him" and stuff like that.) It isn't really a big issue and doesn't really discredit the work, though I feel that perhaps you could've seen those little mistakes when revising your text. Of course, I know that I might have rushed you on that part a bit, so I'm sorry if that's the case ^^.