Maybe I've just stared at the page too long looking for what to do, but I had to come into the comments to figure it out. My eyes completely glossed over "Goal"

Maybe I've just stared at the page too long looking for what to do, but I had to come into the comments to figure it out. My eyes completely glossed over "Goal" as it doesn't really stand out and I just assumed that shape was a logo. Could use some short text saying something like, "Make the left image look like the right image." Otherwise cool/fun game concept, although like others have mentioned, stackEqual is a bit confusing as to what it does.