A low contrast colour scheme inspired by The Legend of Zelda: Majora's Mask, in particular my memory—or rather—impression of the main area (from which this theme takes its name).
Termina comes in standalone light and dark variants (see further info below).
The font is Iosevka term
The UI is Atom Material.
Search for termina-dark-syntax
in Settings > Install > Themes. Or install it directly using the command:
apm install termina-dark-syntax
Project page: https://protesilaos.com/termina
Termina light version: https://atom.io/themes/termina-syntax
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.