I don't hear any resemblance except for the "whoas" sound similar. Definitely nowhere near enough to sue. With that being said, I really enjoyed her song.
You might not see it, but you can surely hear it. That brief melody of the "ohs" is exactly the same. I'm sure it's just coincidence, but I'm sure she'll walk away with a settlement.
Carly Rae Jepsen said "oh" a bunch of times, over and over, in a pattern slightly similar to the way you did in your song that maybe 20 people have listened to before this lawsuit came about (and odds are none of those were the defendants). "OMG COPYRIGHT INFRINGEMENT!"
There isn't a chance in hell this case will hold up in court. This is just a struggling songwriter trying to pry an easy and small settlement from lawyers who have better things to do than litigate this.
Oh fuck off. I don't care for Owl City or Carly Rae, but no. Not even close. I don't expect to even see a settlement out of this one. No way I can see this chick winning this.
Edit: This screams "Hey, listen to my song!" I suppose any publicity is good publicity these days.