Unfortunately I didn't see Felicity before, but having seen Sporkman and Flat Feet & High Heels, there is a part of me that almost wants to boldly ask what could be 'over the top.'
At the end of the day, you have to do what you're comfortable with, and no-one can ask more than that of you.
I have to say though, that having seem some of the other comics out there (and even one particular comic covered on WordOwl...) that the webcomic world has its fair share of 'over the top', so being honest I think there's still a place for 'over the top' comics to join.
A few weeks ago I went on a comic-hunting expedition, and my final list was 229 different webcomics I know about. And that's not going through the list on Oh No Robot. But what I found was that there aren't many comics that are actually 'over the top'. Put it this way, I only found 1 comic out of that list that I wouldn't be comfortable adding on WordOwl - I'm not easily offended but this was really over the top.
I should point out that one of the comics available through WordOwl has received hate mail in the past, and another I want to add rates itself as 16+, so perhaps my definitions are a little generous...
BTW, glad to see the RSS feed is up.