A Blender add-on for building tile based low-poly scenes with paint/map editor like tools · By Jeiel Aranal
I poured over the documentation and interface but I can't seem to find an option to disable auto flipping/mirroring when drawing with the painter tool. I don't think I understand what it's named or how it's implemented.
You can turn off the automatic work plane adjustment by locking the axis. Press it when the work plane works to how you want it to be:Feature Reference - Sprytile Documentation