Not sure if you are still interested in updating the sample game files but I found the wall tiles in the inn were marked passable. I'm developing a simple game using the sample project as a baseline to hone my skills and learn your 8 wave bundles I just bought.
If there is a plug that helps me identify the tile already painted on the map for the exact tile in the tile set, it will help a lot with figuring out the passable or not in database.