Today developer retronx-team has released a new version of stepmania-nx v5.1-nx1 for the Nintendo Switch. Check out the release notes, changelog and the download link provided below.
Release Notes:
StepMania is a free and open source, cross-platform rhythm game. It supports common key-based rhythm game formats (including 4-panel and 5-panel dance games among others), as well as Switch controllers (joycons recommended for their individual buttons), keyboard and dance pad controllers (ex: Gamecube ones with adapter). It is customizable with user-made add-ons such as themes, and provides an integrated editor for creating your own simfiles.
v5.1-nx1:
Initial release, be sure to check the README for instructions like the default control scheme. Have fun !