Some devices, such as mine, cannot run your game without SharedArrayBuffer turned on.
This can be found in the game's edit page at the bottom.
Viewing post in Umbral jam comments
Hello, I'm sorry to hear that you were having issues with the game. My device cannot run the game without the SharedArrayBuffer either. I just checked, and the SharedBufferArray setting is enabled. Thanks for bringing this to my attention, and I hope that whatever issue your device is having can be resolved.
Thanks for taking the time to check out my game. :)