Making Arduboy mockups of classic Commodore games is great way to spend an evening. Dicky's Diamonds was a game published in 1983 by B. O'Shaugnessy for the Commodore 64. The game scales down handsomely to the Arduboy's scale and 1-bittyness.
Watch design recoloured.
Puyo Puyo Tetris is available for the switch, but this Madou Monogatari spinoff got its start back in 1991 for the MSX and the Famicom Disk System. I think Puyo Puyo would look pretty handsome as a MX-700 port.
Wonderboy is one of my favorite games! It was pretty fun trying to recreate a familiar scene in SharpSCII.
I grew up making PETSCII illustrations on my C64 so I had to try my hand at some SHARPSCII.
BC's Quest for Tires is another favorite I can enjoy on the Commodore 64, Colecovision, and the Atari 8-bit. I am really happy with how my Arduboy mock-up turned out.