Good news! It works on Safari iOS! I'll need to wait until I get home from work to test for the desktop version of Safari, but I'm sure it will be successful as well.
Edit: Confirmed working on Safari Desktop as well. Nice work!
FYI, I'm on a MBP that's 10+ years old and running an outdated OS, which can no longer be updated. While the game now loads fine, there seem to be some minor control/keyboard issues that take some browser refreshes to get working. I believe that's because I'm stuck on Safari 16.6.1. On the iPhone, which is running Safari 17.4, everything seems to work perfectly every time.
Not sure there is anything to be done about Safari <= v16, other than maybe mention Agile only officially support Safari 17+ somewhere.