I made a port of R'n'D and Mirrormagic to the Nintendo Switch. The download files, installation instructions, and further information can be found here:
https://github.com/rsn8887/rocksndiamonds/releases
It has all the features of my Vita port, apart from text-entry. So the player name will be stuck at "anonymous" (unless you edit the config file in user data by hand). I plan to add text-entry as soon as the development kit includes a function to bring up the on-screen Switch keyboard. Touch/analog stick mouse pointer control is included, just like in the Vita port.
R'n'D and Mirrormagic for Nintendo Switch
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