Yes, my Microsoft phone. Lumia 650. I had to crawl through every option. Inside one of the options nearer the end of the list, at the bottom of the windows, was 'For Developers' title!
So, I enabled Developers Mode instead of side-loading, turned authentication off, and deployed to 'Device' ARM platform in Universal Windows App Mode.
I had a VB.NET app that loads a page from shotting.cc into a text box.
And, it works! Expression Gradients look cool too!
Really digging this windows phone now I can program for it!