Hey Dave here, I built Pingy CLI. :)
I decided to extract the build tool stuff from the Pingy Desktop App [1] and make it open source and available as a stand-alone CLI.
It's not designed for complicated web apps (use gulp/grunt/webpack instead), but for less complicated stuff it's a good fit. Hope you all like it. I'm happy to answer any questions and take feedback. :)
[1] https://pin.gy/