Needs a lot more polish, if I make too many invalid moves it grows the width of the entire canvas and let’s me move the screen, also needs better feedback on if I clicked and if it was a valid move or not, no idea why so many of my moves are invalid. Some audio and visual feedback is a must.

Its Fun!

So it's basically tic-tac-toe with several boards at once. With no ability to play against the computer it's pretty much unplayable since I doubt it would be easy to find someone to play a game of tic-tac-toe with, of all things. And the background music doesn't seem to play.

Unfortunately, no computer opponent to play with, so I end up playing against myself (then again, wasn't there a movie about this?). The game is quite difficult to grasp, so a little explanation in the comments would have been appreciated.
Other than that, great idea.

Not sure about the rules? Figure them out for yourself. Not really something most people want to hear from a game. The rules are simple but if you aren't paying attention they can be feel kind of random and be a bit frustrating. I don't care to be frustrated even if only for a little bit so here is how the game works (which really should be in the game and/or the author comments).

1. There are nine small tic-tac-toe grids inside of one large grid. Winning the large grid is the ultimate goal. To win a square on the large grid you must win the corresponding small grid.
2. The first play may be placed in any grid they wish.
3. The second (and subsequent) plays take place in the square on the large grid corresponding to the square on the small grid where the last player played.
For example if the first player placed in any of the small grids like this:
| | | |
| |X| |
| | | |
The next player would be able to only place their O in the central square of the large grid.
4. The exception to this rule is if the large grid where you are directed has already been won. In that case the next play may take place in any open grid point.

Ultimate tic-tac-toe (aka super tic-tac-toe, strategic tic-tac-toe, meta tic-tac-toe, and tic-tac-tic-tac-toe-toe) actually has a wikipedia entry where the rules are explained with pictures for anyone who didn't get my explanation. Also, if you browse around the web some you will find there are a number of rule variants as well.

To the author, this is pretty fun. I would have appreciated an explanation of the rules, however, I did learn something new so it is all good. As it stands right now there is only real fun to be had if you are playing with someone so I look forward to seeing how good of a CPU opponent you can come up with.

Edit 7/1/19: So when I saw you had a computer I was excited, it really isn't the worst player in the world. A couple of things I noticed it does that you may or may not want to address as you improve it:
1. First and most important the computer doesn't know what to do when it can move anywhere it wants to. In fact you have to click to make it move. The first time this happens you are a bit pissed because you probably tried to go somewhere strategic and may have even just won O a square. Every time after that though you laugh and be evil and make it play strategically for you.
2. The computer doesn't understand blocking, or maybe it just has a good understanding of the other rules of the game. That I am not sure of. I felt however that the failure of the CPU to block my lines did set me up to win just as much if not possibly more than the cheat described in point 1.

That being said, for an AI put out in literally 1 day you deserve mad props because it does work and it is fun to play against (except the cheat).