Not sure whether to rate it highly for the unique logic and effort put into it, or to rate it low because... well, it's tic-tac-toe. I think it would've been nice if, instead of just making a game dedicated solely to tic-tac-toe, you take the code from this and put it into an actual story. So like, the reader could challenge a stranger to the game for some sort of prize. That would REALLY show off your skill. Just a suggestion, though! Hope you see this review and consider it!
Honestly, what can you say? It's a game of tic-tac-toe, damn it! It's good to see it in this format, though. Gives you a different perception about the game. It's definitely harder to play because you're eager to answer instantly. Not for phones. Kinda wished for some easter eggs.