All positive or negative comments are more than welcome to try to improve ^^

The thing that feels awkward about the images is that they're all facing forward with no other angles.

Base +10, Shinrra +1, grimest +4, bomberman4then64 +6, shaggy88 +6

Ok...
I see a lot of work went into this, and I noticed a few things pretty quick:
As mentioned by GearZeroSky, the facing is unnatural.
Every panel being it's own frame (or occasionally 2) is wasteful considering some ot the pacing & dialog.
Your speech bubbles are a bit awkward. You might consider more rounded rectangles to avoid text clipping.
Narration bubbles might be useful for direction.
A narrative vehicle might help- one of the characters could be keeping a diary or making an event log.
You jump right into the story 'in progress'- but give the reader no clue or 'investment'- I only assume I know who the main character is, and there is no real reason for me to like them (not that that's important- but it helps early on)
Your thought bubbles could probably be more distinctive- cloud-like.
Speech bubbles pointing to 'unknown character' is not a good thing- esp when you have room in frame. Too many 'pointers' (like panel 20) just gets messy.
Footnote anything that most viewers might not know. There is no indicator of when conversations end, or who is talking to whom. It can be figured out, but it should be obvious.
If you're going to use 100% frontal shots- you might want to create some kind of context to keep them 'natural' in- perhaps have most conversations on webcam/camera-phone/'skype'. They interact rarely, maybe that could help.
Add some more backgrounds. Blank frames make it more artificial- which you can't afford.
The font isn't bad, but it could be better. And the text could be black- Anything to help readability.
The 'computer' font is a bit cliche, but works- but computer AI don't 'need to' talk like 'Robbie the robot' except in the movies because they're actually quite advanced- but writers prerogative.
You really need some other angles- even if they are far away, or body shots, or hell- pictures of pets/the room. Make an avatar in an online game if you have to.

Ignore any/all this- it's your vision, you do what you want.

Good luck!

Oh- The library- Go there, get:
http://en.wikipedia.org/wiki/Comics_and_Sequential_Art
http://en.wikipedia.org/wiki/Understanding_Comics

Base +8, bomberman4then64 +6, grimest +4, alxir +4, Kyle8910 +5, bluemandc +6

The problem is that all shots are done in this.
http://pochi.lix.jp/k_kisekae2.html

Base +6, grimest +4