Today marks the one-year anniversary of the release of Half-Life: Alyx, a new installment of the Valve PC game, one built exclusively for virtual reality.

While the Half-Life series, launched in the late 1990s, isn’t as popular as giant gaming franchises like Call of Duty or Grand Theft Auto, it has made a big mark in gaming. Earlier Half-Life titles revolutionized the shooter genre, and many hoped that Alyx would deliver a similar watershed moment for VR gaming.

So far, it looks as though that isn’t going to be the case. While the launch of Alyx delivered a bump in sales for both the Valve Index headset and compatible VR gear sold by competitors, it has become clear that it will take more than a single hit game to make VR headsets mainstream among videogame players.