When playing Metal Slug in OpenEmu, the app can map the game’s built-in explosion and hit effects to trigger controller vibration (e.g., on PS4/PS5/Xbox controllers). Each time your character gets hit, a shell casing drops, or a tank explodes, you’ll feel physical feedback — adding immersion without needing original arcade hardware.
Here’s a relevant feature for when playing Metal Slug (or any Neo Geo / arcade game): openemu metal slug