> I guess you could emulate the "Photo Texturing" functionality in something like Blender with UV Unwrapping? Will give it a go later.

Yes, you can do exactly that. To me the app looks like a happy medium between 2D and 3D art software.

I've achieved a similar effect with Krita's warp tool and 'transform layers' (which let you treat a transformation as a filter layer so you can still edit the un-transformed version), but it's clearly not a use-case the developers intended and therefore is nowhere near as smooth to use.