Which browser?
I do not see the error in Chrome. As mentioned in the topic, we’re using a header that isn’t widely available for the game page embed. It only works on Chrome right now.
You can, however, use the embed from here to get a new URL that should work on all browsers: https://itch.io/game/upload-embed/282067
For example, your game is available here: https://itch.io/embed-upload/5608527?color=333333