My gameplay: https://www.twitch.tv/videos/748057463 (My face froze.. Ignore that)
Overall: I am sorry if I come off as harsh. I am not sure if there was something I misunderstood with this game, if I played it incorrectly or if there was a big happening. What happened to me each time I tried (I even tried off camera later) was that the second player would remove both X and O at the start and then it was a normal tic tac toe game, with the cool aspect of a expanding board.
Unexpectedness: I was mainly confused by the disappearing X and O at the start, other than that nothing else unexpected happened. Is it supposed to happen several times? If it did then I think this could turn into a real cool game.
Gameplay Innovation: I like the expanding board! I often feel when playing the original board that in the end you start to run out of space. I'd love a multiplayer!
Fun: It's tic tac toe which is a fun game on its own. In my gameplay I didn't get much of a spin on it unfortunately.
Visuals: Visuals are great! I think it's really well made.
Audio: I feel like I'm missing some music.
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Thanks for such a detailed feedback! It’s a pity that you played the game yesterday, since I updated it just today - now it has music & better AI. The unexpectedness is in random stuff happening to the board; that you’ve only seen the first two moves disappearing is probably a random number generator issue, I’ve heard this from another player as well. I’ve reuploaded the game just now with a change that (hopefully) fixes the problem.