1. Battle Balls

 +: Simple yet cool concept, and to make the fun last nothing better than multiplayer. Also nice
    Graphics in the concept, if you keep it that level I'm looking forward to play on your arena.

 -: Well it's not perfect but I can't thing of something that is on the negative side about it.

 !: Would be interesting to have something else also than square shapes for the arenas


2. Gravity Bound

 +: I loved to play double bubble when I was around 7 please make me a good remake! Actually
    the oil concept may lead to better game play than the original bubbles.

 -: Make this kind of games 3D always slowed down the game play, it's a big challenge to avoid that.
    Also I'm sorry to break into you but your character is not that cute... sorry.

 !: You could make the gravity shifting necessary to reach certain part of the level, or make
    some part of the level move around to help the player reach those areas.
    In double bubble you used the fact that the bubbles go up to catch enemies above, you could make the
    oil fall to catch enemy below


3. Parasite Paradise

 +: Yours looks like the most ambiscious project, the idea of the entire level being dynamic it's great.
    Also the possibility of some spider-man like game play.

 -: Maybe too ambiscous, you'll need good looking animation, smart camera, LODs for the level, robust
    collision system against a moving level and much more.

 !: About spider-man like game play you could make the flea throws ropes, that way it could still save himself
    if it's falling after a misplaced jump.


4. Speed Thugs

 +: From what you said I got the idea that you'll try to bring the feeling of high speed to the
    maximum... gooood =). Also the idea to have interesting alternative routes it's great

 -: I guess you heard this before but your game looks like a YARG, still better than YAWW2FPS.
    It will be a challenge for you to make it stand out from the populated crowd.
    I don't like cell shading but that's just me, still I think it wont feel right for your
    design concept.

 !: Customizable vehicles, better engines thrusters and so on, not that original but remains
    a winner in my opinion.


5. Titor's Equilibrium

 +: ...
 -: You guys suck... seriously
 !: Going fishing instead? Career as iguanas' haircutters maybe?


6. S.P.H.E.R.E.S.

 +: Mission based spheres arena it's bound to be fun. I like the flipper like things idea a lot, could
    make the movement inside the level fast and skilled.

 -: Will be hard to make the game balanced, meaning that it's not too easy to elude the defender or on
    the other hand defeat the attacker. Good level design will be crucial.

 !: How about jumpads for the spheres and maybe air control, what about rocketju... ok playing silly now.


7. T.B.D

 +: Finally I see the intention to put cooperation again in games, thought it was long forgotten.
    screen scrolling arcade games were always a winner and a lot of fun. And put objectives inside it
    it's a fresh idea from what I know.

 -: Maybe it's just me but VERTICAL scrolling arcade were a lot of fun, never really liked horizontal ones.
    Keep in mind that the only way to make look good a screen scrolling game is to have good looking
    backgrounds and objects, the artistic part will play a major role.

 !: Since you intend to use procedural levels, you could add more degrees of freedom to move around.
    Potentially the level can be infinitely huge.