Great idea! But what exactly do you mean by auto snap? Option for it to just give you animation of tiles connecting on their own, or not letting you do incorrect connections?
The way you have it stepped makes it easy to align. If it had smooth rotate might be harder to align.
Oh, they do already kinda snap together. Nvm!
Other ideas:
-more colors
-maybe scroll for zoom in addition to the [+][-]
-AutoTile: auto fill the viewport complety with tiles, perhaps with random colors
Ah, this kind of smooth rotation. I think this will add unnecessary problem of trying to align tiles just the right way
Problem with autotile is that in case of hat tiles there's restricted amount of ways of connecting them. And so if player have made any mistakes, autotile would fail and make only more mistakes
So either player must be restricted from making impossible connections or program must first check for any mistakes and refuse to continue or potentially just give you a hot mess in result
But Ill save this idea for potential future!