You can open any scene, but start with MainMenu scene to play the demo
Remember to restart the Editor to make use of the new Input System (if prompted)
This is a full project and will override the settings and packages of any project you import it into

Happy Harvest is an official Unity sample project that showcases the capabilities of the native 2D tools in the Universal Render Pipeline (URP).

Announcement Unity blog post

The demo is a 2D top-down farming simulation game that shows what’s possible with 2D lights, shadow effects, skeletal animation, sprite libraries, visual effects, and more.

Along with the demo, we created a series of in-depth articles to show you how to create the 2D visuals so you can add them to your own projects. View these pages together with Happy Harvest to get the most value:

Visit Unity Samples to explore individual files in this sample.

You can explore the techniques shown in Happy Harvest, plus many more, in the e-book 2D game art, animation, and lighting for artists.

You’ll find all of Unity’s advanced e-books and articles in the Unity best practices hub.

Happy Harvest - 2D Sample Project