For as basic Redmatch 2 is, I still come back to it from time to time. Sometimes all I need is a game about shooting guns.
Surprisingly enough it still gets updates from time to time, too.
store.steampowered.com/app/1280770/...
store.steampowered.com
Redmatch 2 on Steam
A free fast-paced online multiplayer FPS with grapple hooks where you upgrade your stats with kills!