Has a fullscreen mode.

It has support for emulated games.

Supports controller navigation.

It is released under the MIT license.

It includes a scrapper that automatically loads the artwork and metadata.

Epic Games, Steam, Origin, Uplay, Gog - you name it, they have it.

Most parts of the launcher, from the font to the general feel of it can be customised via themes and extensions.

There are not too many options.