From executables (suggested!):
Download the intotheheart_builds.zip. Unzip the MacOS or Windows zip inside, and open the .app or .exe for Mac or Windows, respectively.
Navigate to the Play now! link. Please note that the lighting and graphics are lower quality in this WebGL build. If you would like to view this project in high quality, please download the executables found here.
From source code:
Open the project from this provided source code. This project was built using Unity 2019.4.1f1.
In the Unity Hub, ADD the directory for this project, titled SmoothBrain. Click to open the project in Unity.