Cool, hope I haven't been too though, take things with a thick skin and remember the goal is to improve.
Concerning to artwork:
It's smooth and there's a lot of room to improve. Gotta work on anatomy. sometimes characters seems to be ragdolls, and fight scenes lacks intensity, need to aim for extreme and dinamic angles, otherwise it seems very flat, flatter than average dialogue, and if that happens there's no point to have fight scenes. Faces are well defined and discernible even though I think you could go the extra mile adding some wrinkles and exagerating a bit the expresions, even though I believe is the best thing related to artwork in this comic.
Backgrounds, background elements seems to cliche and sloppy, would be nice to enhance the perspective work in there, actually if you used refrence for those even if that would mean ripping off the original, would do wonders, y advice here would be to make your own photo references with your cellphone (if possible) or ask friends to make you that favor of taking pictures to landscapes, buildings and sidewalks, believe me it will do wonders for your backgrounds, I personally don't do this but I know for a fact many artist do that, Bryan O'malley the creator of Scott Pilgrim did it a lot.
And finally color, color palette is somewhat nice, has certain harmony, but above that it's not doing anything else, feel free to compose within color palettes to evoke emotions.
Concerning storytelling:
It is in it's early stages so I can't tell to much, Would be nice if there was more context within the comic, it is supposed to be a post apocaliptic world as far as I Know but the design and the geographical depiction doesn't tell me that, also the main characters seems almost like copy one from eachother (talking about personality), if this is what you're aiming for then you've nailed it, but if you haven't pay attention to it then be careful, try to give them a personality trait and stick to it, let them show that. The villains that appeared afterwards have some spark and is very welcome that their personalities are different.
Finally, You haven't done this, but it is giving me those vibes, avoid exposition! try to keep it at the bare minimum, remember, Show don't tell, for writters this is more abstract and harder to achieve, but us as comic artist can actually show things instead of telling, Keep dialogue and captions for things you can't actually show or to give a costumbrism feel.
Notes:
You have certain basics well stablished here and there, the best advice I could give you is to use photo reference and to study some artistic anatomy, never be afraid to make a mistake and don't ever get attached to a drawing. You are still learning and always can make it better, but in the process gotta crack some eggs to make the omelette.