I got a couple of screenshots from norfair if you want more you gotta let me know how im doing!! also this is only one idea for the tunnel in norfair where you go from purple norfair to green norfair any suggestions let me know i have modified the tunnel so hopefully it looks better
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The tunnel is a bit bland. Also, the tiles you've used above and below the rocks are filled with different shades and look sloppy. I would at least fix the shading problem, and try to add just a tiny bit more interest to the room.