Thanks for pointing this out! I hadn't thought to try it on my Mac. I was able to get it working on Chrome in my M1, but only with a considerable amount of patience. There's a loading step that happens when you click "OK" after choosing your RPG attributes. What it's doing is building out the A* pathfinding graph for the entire map. I'm planning on making that clear with a loading screen once voting is over.
On my Linux desktop this takes about 3-5 seconds, but on my M1 mac it takes about 5 minutes (and also freezes all other chrome tabs). Once I cleared that loading step the game seems to run OK.
I wonder what's going on here? I'm curious why the performance on Mac is so much worse.