Sounds good. I meant to eventually fix the exportCode syntax to make it compatible with the HTML5 GM version's 2D arrays, but I didn't realize that that was necessary yet. (I haven't been following the development of the HTML5 GM version very closely, so I didn't know that it's almost caught up with the SC version.) But if you want to do the work instead, that's fine with me.
Another thing you could do is change the editor so that it doesn't create sprites for the floor anymore. The floor should be a background image, and only the other types of tiles (walls, monsters, everything that exists ON the floor) should have sprites. That's how the game works, and that's how the editor was originally going to be, but I got lazy, and I decided that it was easier just to treat all tiles the same by creating a sprite for every one. It would be more efficient without the floor sprites, especially considering that the maps are made up of 391 tiles, and floor tiles are used more than any other type of tile (usually). This should probably be fixed before scrolling is added.