The dice roller is very aesthetic pleasing, but adding numbers to each of the die icons is absolutely necessary. For folks who are vision impaired or have certain cognitive disabilities that make differing between similar shapes hard, the dice roller as it currently looks is going to be incredibly hard to use.
In general, would love to see tweaks to the site to better align with ADA and WAI/WCAG guidelines, as well as a formal accessibility statement. Great resources are available through W3C: Accessibility - W3C