It's a nice game, perhaps slightly reminiscent of Try Not To Fart on XBLA. The dialogue options are still fairly rudimentary, having some variation with the conversation never really straying from its linear path. However, this is understandable, given the time constraints in the jam.
The artwork is nice enough, especially with the small details like changing expressions and the small Lord of the Rings nod in the background, though the large screen resolution feels excessive for the style. And I did notice that there were sound effects, but perhaps they could be clearer as cues, split into 2 groups: drunkenness and date's approval.
And while high approval and low drunkenness is logically sound as the way to go, do keep in mind that this is a game. It would be good to convey a bit more clearly that the objective is the maximize approval and minimize alcohol levels, as it could be misunderstood that the alcohol level simply affects the interface behavior and not the ultimate evaluation (at least until after 1 playthrough). I can also imagine an alternate evaluation criteria, where the player must try to get both scores up in a sort of "get drunk and get away with it" kind of joke motif.
In all, though, the game does have a good bit of each component one would expect in a complete game all around, making for a solid entry. Good work!