This is a suggestion. You can use butler to validate that itch will know how to run a game. Before pushing, would it also be possible to test run a game if the itch sandbox is setup (on Windows)?
There used to be an app packaged with itch called isolate.exe. I found it in an old bin directory, and it seems to still work for the most part. I was wondering if there was an official way to do it. Butler could have a command like `butler action play --sandboxed .`