Not too bad
It's very stylish and fluid and I like the overall manga-madness feel with all the uber-powerful, ground shaking hits and tosses you can perform as you advance. I also liked that it's not a standard button-mashing beat 'em up and demands a certain strategic approach to it.
Cons:
1. It's the second game you have a BOY as a protagonist, which kinda makes me worry...
2. I understand that a beat 'em up can do without a plot, but the plot of this particular game made me giggle tremendously - a cyborg sent out to avenge the death of his parents (which kinda makes no sense - all throughout it's implied that the protagonist was manufactured, then all of a sudden - he has parents?) while wiping out a gang that was responsible to it, ultimately to be hailed as a superhero... what a horrible pile of cliches. Also, the dude's superhero name becomes "The Steel Boy"? Couldn't have come up with something more creative and/or badass?
3. Some things about that game make me wonder if it was designed to be played by humans at all. "Reach level 300 in survival mode" or "get rank S in all stages in expert mode" for example.
4. The most difficult part of the game is in the AI of the enemies and your vulnerability - there were far too many occurences when I literally couldn't evade or even rise to my feet, because some enemies began their attack right while I was getting up, without me being able to counter or defend it. It could have been better if the get-up had an invincibility state (just like the back kick has), or you could get up with an attack like in Soul Calibur and many other fighting games.
5. From a certain point in the game you don't get to keep your energy you've saved from a previous round, something that looks like a glitch to me.
Tips:
I. For those that bicker about certain enemies being able to break out of a combo - maybe a ground combo isn't the best solution? Throw a quick 3-strike combo, end it with an uppercut - then jump and kick the hell out of the enemy while airborne. You can use the Rising Dragon to keep him up in the air for longer, and it's always advised to end up with an Aerolite Fall to clear up the ground below you.
II. The gun is of an imense value - shoot at your enemies while keeping distance is your safest source of free energy - a fully upgraded gun can get you as much as three batteries worth of energy, and even manage to kill the weaker minions while at it. Best shooting spots - behind and undestructible crate, or when the opponent is on an elevated ground and you're crouching.
III. As you've noticed - English isn't the strongest part of the author of the game, so you don't have to BEAT the game on hard to be able to fully upgrade your fist and gun, only UNLOCK it (that is to beat the game on normal).
IV. Some boss tips - the fatty wears himself out almost after every attack - and it's the best time to unleash your best combo, but you must learn the timing of his combo-breaking punch strike after he gets knocked down on his ass and be ready with a block/evasion. The second boss - just keep the distance, wait for him to run to you, jump over him and then have your wickedest attack from behind. The robot one is a bitch to handle, but he gets much easier when in berserk mode - in his normal form, you'd randomly be damaged simply by standing in front of him, but not when he's in berzerk, so simply stand in front of him, block when he attacks in a downward motion, and roll to his behind when he's shooting. The last boss - the best way to handle him is to come into battle with considerable ammount of exp - 11000 will do on Normal mode, and just spam the super sonic punch at him (if you're on easy mode - three "doom" strikes and he's goner in his second form).
V. The super-sonic strike is your friend - not the rising dragon (the strongest enemies/bosses can't get airborne) and not the doom (ineffective against a boss with his minions present, but good to clear the screen up). Unleash a super-sonic when the boss and the minions are in close vicinity to each other for best results.