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.
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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.