Cool! I tried it with our logo (https://www.airbornos.com/images/logo-mark.png), which is super generic (I spent $0 on it). It came up as 96% unique, even though there's two icons of clouds in the list of similar icons. Furthermore, it would be cool if it looked for similarity with a database of other logos as well, and not just icons.
Other small point: maybe you could show the uploaded logo again next to the other logos in the "Color/Contrast" and "Overall" categories, to (probably) drive home the point how bad your logo is in comparison.