For what it's worth, with the two dates I have lined up for next week, we've only exchanged relatively lighthearted communication. I messaged one first and asked about her progress with getting SCUBA certified. The other one messaged me and said my profile made her laugh, and then I commented on our pictures, since we both had giraffes in them.
Not going to call it superficial, but it's definitely not "deep" -- I think we'd just prefer to get to know each other in person. Hell, I thought I pulled the trigger too early with the first girl, since in my response to her initial reply, I asked her out for drinks. It's way earlier than I usually do it, but I figured, why not?
Anyway, the point is, don't try harder, period. Yes, as stn says, you don't want to get incredibly complex ... but even if you were over some invisible line, it wasn't by much. Frankly, you made a little joke and she responded with something barely literate. I'd count it as a win. Would you really want someone so hostile?