It is for commercial use (I will include it today). By interior, we did think about it; it would be nice if we could switch those wall into transparent, let the character walk into the building. But these are small tile with setup of 512px, not enough pixels for interior details. What do you think?
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In my game, I allow the player to go inside a building but then create a complete separate room that's way bigger. It's obviously not to scale but this gives them a lot of interior area to explore. I agree that it wouldn't work for people who make the walls transparent and limit them to just that space. So, it could work for some setups.