Double click win-run.bat (Windows) or mac-linux-run.sh (Mac/Linux) to build and run the demo. Note that, by default, Mac OS disallows running scripts in this way. As a workaround, follow these steps to manually open the script with the Terminal app.
Code is located in app > src > main.
If something's broken or you get errors about files in use, open the scripts folder, double click win-clean.bat (Windows) or mac-linux-clean.sh (Mac/Linux), then try again.