Sorry for the late reply, couldn't work on this over the week. Could you give me some more information about the problem. How far do you get into the game, can you hit play on itch, does the unity splash screen show up, do you get any audio?
Could you also give me some information on your system, are you on a Mac? I know its web based, but Mac runs all browsers through safari under the hood.
If there is anything else you've noticed that might help me to replicate this issue it would be greatly appreciated.