Should the story focus on or his transformation ?

When he launched it, his webcam light flickered to life. A pixelated version of his own room appeared on the screen, rendered in 16-bit color. In the corner of the digital room stood a shadowy sprite that wasn't in the real room.

The monitor went black. Reflecting in the dark glass, Leo saw himself—but his reflection was moving five seconds behind his actual body.

He had downloaded the game, but the game had successfully installed itself into him. 🚀 Tell me: Should this be a horror story or sci-fi ?