Check the download section:
Android:
- Download the zip and extract to a folder (there will be a .html file and a media folder)
- Find the latest version of JoiPlay here: https://www.patreon.com/joiplay
- Download this app and install it
- Entering the JoiPlay app
- Tap the "+" icon on the top -> "Add Game" -> "Choose"
- Find the .html file of the game in your phone's storage -> "Choose"
- Game name: leave default or input any name -> "Next"
- Version (can be skipped) -> "Next"
- Icon (can be skipped) -> "Next"
- Play the game through the JoiPlay app for the media to display properly