Don’t know what feedback to give: It’s working nicely (although I am unsure how the app determines the next square to place a symbol in), it looks good simplistic, but very fitting and I could find no bug. Really nicely done!
Only thing that I would wish for was an opponent be it AI or another player from around the world.
the next square is determine from the Symbol you clicked. If you click on the left top symbol, your opponent must click next round in left top section!
An AI is very hard to design. Cause if you play it several times, you learn to think a lot of rounds ago before you click a symbol.
A multi-Player-function with players from around the world is possible. But there are not enough players at one time I guess.