Hi Yang. I updated the github and also included the unitypackage file in the game page.
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Your source is missing folders. Your source is everything someone needs to download your game, open it in the game engine, and hit Play to play the game. In your case, your source is missing the Assets, Packages, and ProjectSettings folders. Here is an example of what your source should look like: https://github.com/icepol/DeathIsOnlyTheBeginning