Interesting game, I played against the AI. It's smart and not simply making random moves. Well done!

Thanks! It uses the minimax algorithm to a depth of 5. Beyond that, it starts making silly moves :D

Fun to play and somewhat challenging. The rules are simple, but I kind of wish there was a single pop-up with the rules. It would have saved me some trial and error.

Sorry, there's some rules here: https://monsiv.com/how-to-play Hopefully it makes more sense now!

Very nice. I notice I keep accidentally swapping pieces when I mean to switch to highlight a different piece. I wonder if a dragging motion would be more natural.

That can be annoying, I agree. I tried to get drag working nicely when I first started building it, but it was a pain to get it working on all the different mobile browsers. I've put it on my TODO list to revisit though.

Suggestion: click select the other piece, click & hold swap them

I lost a couple of times because of that