Sorry about that. That's my teenage son. I'm trying to teach him game development and a big part of it is figuring out how to research and ask questions well. He still has a lot to learn on this front.
Let me clarify for him. He's trying to make the walls of his level have collision. He's followed that top-down bullet hell tutorial that's out there, but it doesn't cover collision. I'm not sure if your answer can apply to room tiles. Thanks for any help you can provide!