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Please PLEASE don't LAT your insides like they do. The style they use for (for example) the ET house is nice and all but only works for that specific level. Your walls are lacking, they are short, and not very visually attractive.
The fourth level is my favorite if it wasn't for those black spots and the ugly walls. The floor looks alright though. Overall just keep practicing, that's all there is to it.
p.s You can use alt + 1 to take full level screenshots.
