Hey Jonas,
happy Easter to you too!
A font instead of uploaded images instead of icon menu items is not possible via the admin settings in Ikebana at the moment, yet I’m surely considering adding this feature. One thing you could try out first, though, is adding larger images: e.g. if you use 140×140 pixel images (transparent-background, flattened png’s would be the most suitable format) with some padding around the icons, they would be fitted into the available icon menu item area by the existing “background-size: cover” CSS property. Please let me know if this is something you’d be willing to try, and if it does help improve icon menu image quality.
Sincerely,
Andrii / Satori Studio