Really well done. Easy to get into, fun and playable. Card themes are funny with just the right amount of self deprecating humor. The art style is nicely casual but not stereotypical. Characters are funny but adding some facial expression animations would be awesome. The whole thing work very well as a complete package.
The card part itself looks well balanced although I didn't test it thoroughly enough to be certain.
I'm just not sure the thing you afflict on your date should be called "damage". Maybe replace it with something funny that fits the theme better.
Btw why don't you let us read funny descriptions on date's cards?
I wouldn't mind seeing the girl vs. girl and boy vs. girl DLCs as well ;)