Same. It's a solid four-note ARP that sticks to a fixed set of musical keys. You literally can't make bad sounding music with this.

A more grown-up version of this would be 16 notes, with variable length patterns (4-16?), and a "swing" function. A little bit of I/O mux under the hood and I bet this design could be expanded in that way. Or maybe you just daisy-chain multiple sequencers?