If you liked this
Games like D-Day: The Beginning of the End
If you finished D-Day: The Beginning of the End, the closest matches are Mewgenics, Sid Meier's Civilization VII, Caves of Qud, Xenonauts 2 and Endless Legend 2. All 36 share its simulator genre and are ranked by how closely their themes and modes overlap.
91
Mewgenics
82
Sid Meier's Civilization VII
94
Caves of Qud
88
Xenonauts 2
85
Endless Legend 2
82
Corsair Cove
85
Dead In Antares
80
R-Type Tactics I & II Cosmos
87
Sid Meier's Civilization V
87
Sid Meier's Civilization VI
85
Fuga: Melodies of Steel 2
85
XCOM 2
95
Sid Meier's Civilization IV
89
XCOM: Enemy Unknown
100
Advance Wars
91
Rome: Total War
90
Into the Breach
85
Tactics Ogre: Reborn
90
Medieval II: Total War
80
Dorfromantik
88
Total War: Shogun 2
79
Humankind
91
Sid Meier's Alpha Centauri
90
Fuga: Melodies of Steel
87
King's Bounty: The Legend
91
Advance Wars: Dual Strike
86
XCOM 2: War of the Chosen
87
The Banner Saga 3
84
Dwarf Fortress
Liar's Bar
Dungeon Clawler
82
Sid Meier's Civilization: Beyond Earth
81
Northgard
90
Space Rangers
83
Sid Meier's Civilization V: Gods & Kings
83