(Game not tested yet.) Just to let you know, the game page tells me on the top that no file is available, which apparently means that you set up your project as having a navigator version, without a navigator file (or without a proper one?).
PS: seeing at the bottom that you did provide a ZIP navigator build, you might have missed the checkbox to enable the file for navigator launching.
PPS: on second thoughts, no: I see the ZIP is the desktop version, so the navigator one must be the other, titled ‘https://simmer.io/@tanruss1/tower-of-darkness’; the URL does work, by the way, but if you want the itch.io player to work, then a ZIP or HTML file should be provided. Nothing serious as your game works!!