Since I'm posting Super Mario Maker levels now, I figured I might as well post the first and only level I made for Portal 2: Hello Multiverse. I thought the Portal 2 level editor was brilliant, but after beating both the Solo and Co-op campaigns I'd had my fill of the game and didn't feel motivated to play or make any more.

The chamber itself is fairly simple, but I felt like it was a good starting point at the time. Here's a play-through of it I just found, recorded by DiscussorGameVideos.