What a nice game!
Maybe a bug note: I was 'holding' a card with the pointer when the pawn crossed a purple dot and the card in my hand was taken away. I couldn't click on anything after that, though I got a slide-whistle type sound.
There is a big issue that I've encountered three times: The game will completely freeze my computer (mac, up to date). Not just the browser software but the entire computer, necessitating a hard restart. It even froze things up once when I was on a different webpage with the game idling in the background.
Do tell if you know any more details when this happens. Seems really weird. I guess it's something randomish if it happens on the background too. I'm on mac too so don't think it's anything to do with that. Could be a memory leak I guess but seems very weird that it also happens on background (when there isn't really anything happening).
Fixed the held purple recycle bug btw...
The bug is definitely in your game as it hasn't happened before or since without the game running. And, as a Mac user, you can appreciate the unlikely power of a bug that can freeze the entire system. I couldn't even move between windows. I don't think I was even doing anything particularly heavy with the computer otherwise.
If I'm the only one then it might be a freaky me-specific issue. Hope so!
I admire your game! I showed it to other game designers as an ideal of the 'game is analog but wouldn't ever actually be fun playing analog.'