How to verify the game is probably made with @godotengine:

- If it's an HTML/web version, fire up DevTools (F12) with the Network tab open, reload the page like itch.io, press Play and search for a request to *.pck file - it's a common ZIP archive extension for packing game's source code and assets in Godot Engine.
- *.pck file comes with executable in additional ZIP archive (weird flex, but OK).
- Don't.