Managed to get it working on macOS, turns out you have to leave it running for 2-3 minutes, it'll lock up the entire browser in that time, but eventually returns.
So glad I did, great fun, lost far too much time playing this 😂
Only comment would be that the difficulty curve doesn't seem to increase much, you always seem to have the edge as the player as you build the train and turrets up, felt like I could just go on forever. Nicely done though, plays well, simple controls, and great fun.