Ah, I get where you are trying to go with this!
We actually had a fun idea to add a bonus level transition. If you manage to do well during your playtime, possibly a simple cutscene plays, showing the giantess growing, white clouds fading in, while the new size map is loading. After that, you would get your giga play size! X3
We wouldn't have to worry about seeing the tinies on screen, as you pointed out that they would be too small to see. :3