5 1/2 hours in, I’ve managed to get the game to read this file…

And import it into the game like so:

Still having a bit of trouble rendering the tiles though, but I should have that fixed in the next few hours.

Next up, “chests” 😀

Edit: Who would have thought that changing one letter would fix all of the problems 😀

From:
for (int x = (int)tl.X; x <= tr.Y; x++)

To:
for (int x = (int)tl.X; x <= tr.X; x++)

Can relax now 😛