Super fun little tile editor! One thing I noticed was that save states don't work with everdrives for this. My guess is it has to do with no vblank interrupts being used for this. This was all I found for this so just wanted to throw it here in case you were interested in adding everdrive save state support in the future.
https://www.reddit.com/r/everdrive/comments/eo18q4/does_anybody_know_how_to_trig...