I don't mind commenting on the portions of the game that are completed. Actually resuming a game on KGS after someone escapes without comment is super rare, anyway.

Q17, while a tempting move because it makes territory, is generally considered too small in this situation. You can also look at alternative moves for

I can't definitely say this is a bad move, but it doesn't seem to work very well with the move at E4. It looks to me like you're inviting white to split you up into two weak groups.

Denying white a base here looks like a good move to me.

At this point, I like black's position on the bottom much more than white's.

Since the ladder works for white after

, I think you need to go ahead and cut at G5 here. It's a messy fight, but once white gets a strong living shape, your E4 stones aren't doing much work for you.

Oops. Even at

, keeping your stones connected is more important than saving the two stones. Just play D6 and then connect and do your best to recover from your mistake. Things are difficult for black from this point, though.
You recovered nicely after this point, and I think you have learned one of the most important lessons at your level: an early mistake doesn't mean the game is over, because your opponent is likely to make mistakes that are just as big (or bigger!) later in the game. You appear to be comfortably ahead when your opponent quit, though there are still opportunities for more mistakes to happen!