When you select one of the games, PS4 Simulator will simulate both loading and running it. That said, most menu buttons don't work, so you can only navigate through the PlayStation Store, What's New, Test Folder, and Library menus.
Once inside, you can navigate freely through the various menus and even pretend to run multiple games from this console, such as God of War, The Last of Us Remastered, Marvel's Spider-Man, and Horizon Zero Dawn: Complete Edition. When you open the app, simply double-tap on the screen to start running the interface.
PS4 Simulator is an app that lets you simulate running the PlayStation 4 interface on your Android smartphone or tablet.