A good contest, I'm looking forward to its results. I have been on your site for a month, I found that it was very nice, everything worked smoothly and without any errors. However, if allowed to comment, I want you to upgrade its look, we prefer an eye-catching interface.
I do not think they need to change/upgrade their interface, keeps like what they have now is better because it is simple and eyes-friendly. Of course it is subjective, some people may agree with you but some others may not. That's why there is way to switch between dark and light mode. I think it is more than enough.
I agree with panjul07, I love YD's interface, especially the night mode. It's 10x better than any dice site I've played on, and I've played on a LOT.