I’ll suggest Vertigo 2 as a worthy followup.

It really impressed me with its detail and scope as a mainly solo effort, by a developer who worked at Valve for a while. It’s a big, cinematic shooting adventure, like Half-Life, so the game calls itself a half-like! There are cool bosses, memorable characters, and wildly varied environments. The story is pretty much a flipped Half-Life: you’re the alien who got teleported in after a big science disaster and you’re fighting your way back home. Compared to Alyx, which takes places around a handful of city blocks, Vertigo 2 throws you around a much larger-scale setting, so it’s more like the Half-Life 2 kind of linear gallery of wild shit.