RE:Flex Playground is primarily an experimental platform for interfaces created for the RE:Flex Dance Pad v2. It supports the longer term RE:Flex Nexus project as a place to run new feature experiments before they're integrated into the main codebase, in an agile format.
If using this project within your own work, you should expect no long term maintenance, minimal tooling integration for the project, but decent code quality nonetheless.
As with all RE:Flex Dance projects, this project is MIT licensed so use it however you like.