Noticed my typo 3 days later lol
I make typos all the time - normally I wouldn't care that much.
But this is literally the only explanation/introduction for my game - the only way you interact is by clicking a tile:

It is supposed to say: "Click a tile next to the vacant tile"
VACANT - not adjacent lol
Now I'm shocked that I haven't had any comments on it - guess everyone still figured it out just fine???
Too funny! Next time I won't wait until the last hour to make the tutorial, ha.