We have released a native, nightly build of StepMania 5.3 for the new ARM-based Macs using the Apple M1 system-on-chip. We've been surprised by how smooth the game runs on this architecture, so we hope you will give it a try and report and issues you encounter.
The build currently does not support controllers and pads, as we are currently awaiting dev notes on the topic from Apple.
You can download the build here; please note that this build is NOT a universal binary, and only supports M1-based Macs.
Thanks again for your support, and stay safe everyone!
EDIT (12/12/2020): We have controller support on ARM now, which will be included in the next public build.