So yeah, level 18 might be a tribute to one of my favorite Click games. It's basically a copy of Id's avatar pixel-for-tile, but I like it. The metal, being one big image to reduce object count, increases the file size by a megabyte uncompressed, but meh. I'll probably figure out a way to compress it some.
I just need permission. Hey, Id, is it okay for me to do this? I kinda like it. (Plus it means the next demo will come out faster.)