It also doesn't seem to support any form of drag-n-drop, which is (IMHO) the huge advantage of the Mac's command-tab and Mission Control. I can drag anything to anywhere, even if I'm not seeing its eventual target yet. Nor does it seem to support command-H/Q, or play well with Spaces.
It's cool that you made your own switcher, but in terms of everyday usability, this feels like it gives up a dozen features of the built-in one I use a hundred times a day, in exchange for one nifty new feature (view all windows + keyboard control).