I decided to give the SoMa Rumble of Ancient Times a go.
I was a bit sceptical because this whole chiptune, 8-bit video game sound thing is not my cup of tea at all. But there are certain types of explicitly digital sounds I do enjoy, and based on the YT demos it seemed capable of those too. Further on the plus side: small and very lightweight unit, affordable too.
However the unit is rather unpredictable, which is not usually a bad thing, but it strays too easily into the dreaded chiptune Pocket Operator territory. Also you cannot save any sounds or settings, every time you turn it on you'll be starting from zero all over again. In the end I sold it after a couple of days of messing around with it.