Nice! Unfortunately it may be difficult to get it running at good performance on mobile hardware. My PyGamer claims your “Mode 7 with perspective” demo is running at 0.4 fps :-/
This could be sped up by moving to integer math and avoiding divides in the inner loop, but I think it’s still going to be a strain unless there’s low-level runtime support for perspective texture lookup. There’s blitRow (see Is it possible to write directly to screen (pixels) on the Arcade? - #8 by mmoskal), but that can’t do perspective correction as far as I know.