Very enjoyable game.
I also had that cross origin error, but I can play just fine at the direct link https://html.itch.zone/html/7148269/0_7_hf2/index.html
On turn 51 the game became unresponsive instead of placing enemies. It’s probably because I almost fully encircled the playing field with plants, lol. Though another noteworthy event was a monstrosity killing another monstrosity just before.