Tobias Fröschle let us know about this.
If you’re only looking for a similar environment (i.e. not an exact copy of SuperBASIC), it might be worth looking into SpecBAS, an evolved reMake of 1980 Spectrum Basic for various modern platforms. It’s not exactly SuperBASIC, but “feels like it” (Or, rather, like a “Spectrum on steroids”)
See https://sites.google.com/site/pauldunn/