Being able to do a gigantic map can be a nice thing for a free/creative mode for the more casual players (or moods). :)
In the video, when you went from the edge to the center of the map, with the game being unable to render all the decorations in the process, for me it was pretty decent as it gave that blurry feeling that came at high speed. I couldn't see the decorations clearly, but I could see some flashes here and there. hahaha Maybe, at far distances, trying to load just a few random tiles might do the trick.
Good luck in the GMTK jam! :D
Also... A HUNDRED THOUSAND LINES?! :surprised_pikachu: