HOLY SHIT SON
It's Will and his band of merry shoes (to quote an awesomepossum Chelsea) Probably will get around to updating the characters pages, as I realize that there all these characters besides the twins ;D
I've been sneaking peeks at this comic since it started, but the update schedule scared me off, so I didn't read it in full until now.
Herpderp cumulative feedback time. I did read through all the other comments you got, but I did so in one go so I likely forgot some. If I repeat something already said, please forgive me.
Flashbacks: Some are very clear, some are not. I think overall, it should not take conscious observation to notice that something is a flashback. We shouldn't have to notice the clothing, hair, setting, etc. This is why most comics use different panel styles - we pick them up on an almost subconscious level.
I think using thicker/thinner/double panel borders or rounded corners might help. If you're trying to keep the flashback panels as inline with the rest of the story as you can, then perhaps only round the corners of the flashback sequence as a whole - the outermost corners would be round, everything within would be normal.
Many of the faces are skewed to the right. I take it you're right-handed? When you sketch, use a mirror or hold the paper backwards up to the light to see the sketch backwards. This should help you pick out the skew and fix it before you ink.
There are often lines sticking out of the panels, which I feel detract from the otherwise very tidy art. Artist's/masking tape should help with those, particularly if you do your panel borders before you do the interior inks.
I didn't really like the grungy effect a few pages back. There is occasional dirtiness like that on the "clean" pages, perhaps that's why. It didn't feel unique/intentionally grungy.
I am curious - how do you do that wonderful hatching? It's so well-spaced and the lines stay parallel. Is that crazy pen skills or magic?