Move: mouse / joystick
Roll: QE
Boost: L-shift

Disclaimer:
Unity video player is currently not supported for WebGL

For the full experience check out the windows build :
https://drive.google.com/file/d/19pW-ZvsrzxZTIAS6xUeJgDIGMtHlFcza/view?usp=sharing

Here are the videos you are missing out on :
https://drive.google.com/drive/folders/1-9IGCSeXf7lXUIfbZRJAXWlFXiX8DhFl