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Set the wall autotile to square passability, 5 priority.
Use the charactersets if you want...
A tip to make the temple a bit more icy. Make a new characterset from 194-Support02 (the first characterset which is a sparkle). Set it to Stop Animation, Always on Top and Through. Copy the characterset to different locations (just don't overdo it).
There is the possibility for a lot of detail in your maps when using this tileset even though it's small. You just need to know how to use them