Very small things…
The panel, if in dark mode, and used in “unity” mode, makes the menu title invisible when opening a sub-menu. This actually doesn’t happen with a light mode panel.
The volume icon becomes invisible in light panels.
I think the inter-launcher icon spacing in TopX is too wide. The dockbar inter-icon spacing should be tighter.
The terminal app [desktop] file should have “new instance” in it. I did not see a way to launch another terminal instance from the dockbar.
Yes, that is my list of very tiny problems that annoyed me ;).