Games like DownFall BattleGrounds

If you finished DownFall BattleGrounds, the closest matches are Tom Clancy's Splinter Cell: Conviction, Call of Duty: Black Ops 4, Metal Gear Solid: Portable Ops, Plants vs. Zombies: Battle for Neighborville and Breach & Clear. All 7 share its shooter genre and are ranked by how closely their themes and modes overlap.