Excellent, But...
But i have one idea for the Sequel.
There should be at the end when you get 100% (or do all the storylines) that you all come together and face a giant boss thats not playable. Like if it was in this game, it would be you would play as Alloy, when Alloy would die you would turn into Pico, then P-Bot and so on.
Just a suggestion.
Also a Strategy for the Last Convict Level.
ALWAYS keep moving, dont even try to attack.
When you jump, spam the Quick Attack, if you get hit, spam the Block attack tp parry and if you are close enough, attack them in the air. When you land, move away from the enemies, if you are at the wall, you jump up and over them.
ALWAYS get the Pick-Ups (unless its Giant Form)
Let Pico or Nene get the gun if there are 3 people left. Then move around and let the other enemies go infront of the enemy who has the weapon. Then the Enemy who has picked up the weapon will damage another player, allowing you to attack another without worry of being Flanked or being hit by two people. If there are 2 people, get it if possible. If you are Alloy, Tankman, Alien Homind, or Pico, go get it regardless.
Kill Samurai-Asshole first. Then Pico, Then Nene.
If you are these characters...
Alloy: Attack the enemies in the air with Quick Attack
Pico: Try and attack the enemy as much as possible in the air with a Fierce Attack
P-Bot: Attack with either attack in the air.
Nene: Keep Jumping and Dodging
Samurai Asshole: Attack in the Air with either attack, you can attack on ground but is not advised.
Salad Fingers: Thank God for his Reach... Attack anywhere with any attack. But if they are near you, Jump immiedately - dont move as he moves slow.
Piconjo: Keep Jumping, his attacks are quite slow, but you can spam Fierce Attack whilst in the air (to get his "Circle Attack") to protect yourself. You can Guard as well as his Guard is quite strong.
Tankman: Run. Just Run and Jump like hell.
Alien Homind: Same as Tankman
Convict: Same as Alien Homind and Tankman.
Pick-Ups:
"Giant Form": Dont pick it up.
Ghost(?): Although this has never dropped for me, i recommend you pick it up. If the enemies do then you have another enemy to worry about (for a limited time) that may screw you up.
Rage: Pick it up and Attack, Although not sure on OMFG mode. The enemies will just keep there shield up so you can attack them.
Invulnerbility: You MUST get this. This is essential to dealing damage. Basically attack the crap out of the enemy.
Vortex (if you have it): Although can be annoying in the hands of the enemy, 45 damage can change the outcome of the battle, so try and get it.
Health: Get it. This is also Vital.
Gun: It depends who you are. Look above for details.
Regeneration (if you have it): Get it. This is also Vital.
Things to look out for:
Samurai Asshole: He can juggle quite well and has good range and high attack damage, but attacks slow-ish.
Pico: His air attacks are extremely powerful, fortunately he has short range.
Nene: Although powerful, she is quite slow so you should not have to worry about her.
This is my strategy that has worked for me a few times. Hope this helps!