The AI is very easy to beat. It's not looking ahead more than 2 moves, it seems. Try putting 2 dots next to each other and sometimes the AI will let them go unguarded.
I asked my 5 year old to play it, and he could beat it just 1out of 10 times. He doesn't look more than 1 move, so it figures.
The interface is very simple but effective. Doesn't have a lot of whiz bang.
I guess this game is good for kids. It might have been better if the interface was designed to be more attractive to kids.