I've been playing a really similar game called Tic Tactics, the only difference seems to be you can play in a won square until it's completely full then it becomes a free move. Not sure what overall difference that makes to tactics but it's interesting they made that small change. A big difference is taking a board doesn't give your opponent a free move, which improves late game a lot.

Actually it also starts the game with 9 moves each which makes things interesting, any collisions match and you can't take three in a row or the middle tile.