Games like Ginga Eiyuu Densetsu III

If you finished Ginga Eiyuu Densetsu III, the closest matches are Mugen no Frontier: Super Robot Taisen OG Saga - Exceed, Avatar: Pandora Rising, Space Marines, Space Clash: The Last Frontier and Schwarzschild: Kyouran no Ginga. All 10 share its strategy genre and are ranked by how closely their themes and modes overlap.