How would you have Chair handle the probably Shadow Complex 2? I asked myself this question the other day and came to the basic conclusion that while it was a fantastic game, since they encouraged players to play it repeatedly to get up to level 50, most players got totally burnt out on what Shadow Complex had, so any sequel will have to make significant improvements to be as fun. 
 
Storywise, It'd have to justify being a lone man in an enemy filled environment again. Course now he's rolling with the FBI, so that'll be a little harder than it was before. I'd say that enemies seize some town of which Jason has a personal history with, but the army's intel gives them reason to not strike immediately, giving Jason reason to run off into the town to save loved ones alone, perhaps denied the technology he retrieved in the process. I'd like it if they improved the writing of this one as well and stop talking about Card since he obviously was no credit to the story of the first.
 
Weapons wise it simply needs more variety. I'd have them make several assault riffles, shotguns, handguns, flamethrowers, energy weapons, silenced weapons, whatever. They could make it so that certain guns are clearly better than other guns, that gun replacing the inferior gun, as it could be one assault rifle replaces another, a revolver replaces a hand gun, and a shotgun replaces a shotgun. As for the grendades, foam, rockets so on, they should have less ammo packs and more general upgrade packs. Maybe keep the amount of upgrades for each the same, but split them up between ammo, power, rapid fire/mortar, ect upgrades. Also more of these would also be fantastic. 
 
Controls would probably have to be left and right for your bumper weapons and up and down for primaries, losing support for the Left Grenade, Down Foam, Right Rockets, Up grapple scheme, but they'd lose that if they added another bumper weapon anyway.
  
For the enemies, variety would be the only improvement you'd have to make. In the first it was just kickable robots, dudes, dudes that had heavy armor, dudes who had cables and dudes who had mechs. A lot more variation could really improve the game. Maybe some with night vision or thermal goggles you have to take out if you want to do the stealth thing? Or jetpack using enemies that you can hit with foam to make them crash horribly? 

Full three dimensional movement. Don't just limit it to x and y axis, let's be able to move on the z axis as well.

A Samus skin. 
How awesome would that be?  Come on . . .

more cowbell. 
 
 
Actually bigger environment more weapons basically a retail game.

Multiplayer!

" A Samus skin. How awesome would that be?  Come on . . . "

" inverted castle for the second quest...  "

Personally, I would more like to see a spiritual successor versus a sequel. 
In other words: Drop Orson Scott Card and his Empire franchise. The guy's at Chair proved themselves as making really rad original environments with their previous game Undertow. 
 
I really can't wait for a sequel. Totally did everything in this game.

" Full three dimensional movement. Don't just limit it to x and y axis, let's be able to move on the z axis as well. "

"Multiplayer! "

Multiple, selectable weapons would be awesome.
 
Something else I would like to see would be brief missions outside the "complex" or map you're exploring that unfold like traditional side scrolling levels, in theory kind of like what was done with Assassin's Creed II's small missions outside the open world.  I think that could be really fun and let them try a bunch of new things.  The basic feel of the game is so great that it would work just as well in a more traditional side scrolling style level, and they could make some more action packed and controlled moments.

" Nolan North "

" @Delta_Ass said:

" Full three dimensional movement. Don't just limit it to x and y axis, let's be able to move on the z axis as well. "

...You didn't get the point behind Shadow Complex's design, did you? "

" @Delta_Ass said:

" Full three dimensional movement. Don't just limit it to x and y axis, let's be able to move on the z axis as well. "

...You didn't get the point behind Shadow Complex's design, did you? "

FISHING MINI-GAME! Also, basically do the same thing again only bigger and more weapons.
Perhaps go all out Metroid and have it begin the same way every game. Constant reboots.

" @Hailinel said:

" @Delta_Ass said:

" Full three dimensional movement. Don't just limit it to x and y axis, let's be able to move on the z axis as well. "

...You didn't get the point behind Shadow Complex's design, did you? "

No, I got it.  I just didn't like it. "

" It's people like him that are causing 2D to become impossible to market these days :P "

" @Delta_Ass said:

" @Hailinel said:

" @Delta_Ass said:

" Full three dimensional movement. Don't just limit it to x and y axis, let's be able to move on the z axis as well. "

...You didn't get the point behind Shadow Complex's design, did you? "

No, I got it.  I just didn't like it. "

Hmm.
 

• No friction dampener. Fuck that thing.
• Hire someone who knows how to write dialogue and characters.

3rd person shooter with TDM multiplayer.
 
I jest.
 
But yeah, better dialogue would be nice, and better character models. Up close, that girl you rescue looks rough.