not bad
I would just love to see a two player mode! I have no idea why no one has ever thought of this before. Just add two player support and this will be sure to make it here. Also maybe just a few sound effects would help, I hate playing games that feel like they are from 1920.
Nice but..
It's tooooooooooooooooo easy. so make a harder lvl next time. :D
Buggy
If you win agains the AI, the AI gets the first move, but since you have to be first one to choose a place, the AI get 2 moves instantly which will always lead to it's victory since you can't counter his strategy after he chooses two places instantly.
needs improvement
its simplicity is cool. really.
but certainly it needs to allow to choose the level difficulty.
also, i would like to choose between circle or ex.
i would REALLY like to START a game, not always being the second.
and for last, there's a bug: you can click on a circle that is already placed.
Better algorithm needed
basic game, basic everything. Since it's just a test of your knowledge here some tips that maybe you don't know.
from the looks of it the computer is just picking boxes at random. Maybe look into doing a brute force recursive algorithm to enable it to pick the best box to select. If you don't know what that is, google it. If you would like help you can PM me and I'll give you some pointers.