At the moment this add-on uses a slightly modified version of XF's menu system. It doesn't really behave too much like facebook's version atm.
As for icon size and such, have a look at the "Content ratings" style properties, as there are quite a few options:
(note some of these options are from 0.12.1 and aren't yet available in 0.12.0)
Try increasing the "rating hover animation scale" to increase how much the on-hover enlarge affect is.
You can set a higher-definition URL on each rating as well, but if using sprite mode you may need to add a manual transform affect to scale the icon up.
Look for the "Rating type icon" style property and add the following css into the Extra/Freeform CSS/LESS code field:
CSS:
padding:4px;
transform:scale(1.5);
Note this will break the on-hover scale affect, I'ld need to tinker with the css more to get sprite mode scale up properly (the default smiles are a fixed size, there are some higher resolution ones around but it takes manual setup).
That is a definitely a bug, the responsive design needs some hitting.