Heh. Yeah, I think it's way too easy to overwrite tiles with other textures. I need to go back to first principles to remove some of the bugs. The logic around what a tile is, and how it appears on screen, is way more complex than I'd first thought. I have a newfound respect for developers of crafting and survival games!
Thanks so much for taking the time to download and play it. I really appreciate you persevering with the bugs and oddball concept!