Valve game designer Greg Coomer hinted in a media interview that the company is working on creating new stories for half-life and Portal.

There is much more to say about the world of Half-Life. Half-Life: Alyx is a sign that Valve has something to say about this world.
At the same time, he clarified that Valve develops a lot of games. According to the designer, many people are involved in the development, although he did not give exact figures. He also did not specify which projects are in the works. He also told how to create Half-Life: Alyx was a lot of fun.
It should be noted that the company’s representatives have been repeating the same thing for many years, but very few new games have been released. Often these are either remakes and remasters of existing projects, or fan additions, or games that only slightly expand what’s already there.
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Source: VG Times