One floppy holds 176KB per side. One full screen of bitmap graphics is 8KB+1KB color, but the game fills only about 2/3 of the screen, so lets say 6KB w/o any compression.

I don't think it's a problem. The game is static enough I think it'd even be viable to hide most loading time even from a real floppy w/behind animation (e.g. slow down door opening and a fade long enough for a decent fast loader to load 6KB)