Half-Life is a twin-stick roguelike in this Valve-approved mod, and you can try it now

An image of Gordon Freeman from Half-Life, dressed in an orange HEV hazmat suit and wielding a shotgun. He is standing in front of a blurred, industrial background.

Half-Life has a long-lasting and healthy modding community, enjoying countless fan-made campaigns and even a complete remake—2020's Black Mesa—which originally started out as a passion project in 2004. 

Next to reinvent the low-poly wheel is Codename: Loop, a roguelike remix of Valve's 1998 classic. Developed by Daniel Almenara (Pinky_GameDev on Twitter), the game promises to take you through an "ever-changing loop" of Black Mesa, complete with new enemies and weapons.