-Towers and items should be in separate sections. -Show/hide families should default to hide (IMO). Maybe even remove the show/hide families button and have another overlay icon displaying the number of towers in the family? -It's not obvious that the legend tab opens (mouse cursor doesn't change when the tab is hovered over). I'd suggest flattening the legend into a single line and have it running just under the "Next YouTD version (8 | 18 | 1) " header.
But nonetheless, the changelog page has already proven really useful as is. Thanks for adding it :)