More like XCOM 2: Escalation

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H. G. Wells' War of the WorldsUniverse
universe65 books1898
Science fiction and alien invasion.
“No one would have believed, in the closing years of the nineteenth century, that human affairs were being watched keenly and closely from the timeless worlds of space.”
from the catalogue
Start with The War of the Worlds →
includes The War of the Worlds
Ender's GameUniverse
universe39 books1977
Set in far future.
“To beat your enemy you must first understand him so completely that you love him — and in the instant you love him, you destroy him.”
from the catalogue
Start with Ender's Game →
includes Ender's Shadow, First Formic War, Second Formic War, Ender Wiggin, Fleet School
Forever WarSeries
series10 books1972
Set in far future and space.
Start with Hero →
Known SpaceUniverse
universe142 books1964
Set in far future and space.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Man-Kzin Wars, Ringworld, Fleet of Worlds
DeathDaySeries
series2 books2001
completed
Science fiction and military science fiction, tense in tone, about aliens, set in near future.
Start with DeathDay →
Old Man's WarSeries
series16 books2005
Space opera, set in far future and space.
“Sign a document at 65, saying you intend to join up 10 years later.”
from the catalogue
Start with Old Man's War →