itch.io

Whenever you want to publish a game with Unity, you have to build it (File -> Build and Run or File -> Build Settings) to create an executable version of your game. What you published is the actual folder of your game that contains the entire Unity project, so everything your game needs to play inside Unity or to build. Then it is not possible for us to play it, because there is no executable in your folder and it contains only your Unity project.