Brooding is used to describe an atmosphere or feeling that makes you feel anxious or slightly afraid. (LITERARY)
The same heavy, brooding silence descended on them.
ADJ: usuADJn
2.
If someone's expression or appearance is brooding, they look as if they are thinking deeply and seriously about something, especially something that is making them unhappy. (LITERARY)
She kissed him and gazed into his dark, brooding eyes.
ADJ: usuADJn
Wikipedia
Incubation: Time Is Running Out
Incubation: Time Is Running Out (also known as Incubation: Battle Isle Phase Four) is a turn-based tactics computer game from Blue Byte released in 1997. In the game, the player controls a squad of soldiers in a campaign against an alien threat.