It's not scary it doesn't leave much to the imagination the environment is well lit and the threat is fully visible.
I do like the setting with a post apocalyptic feel and an empty world that also serves the gameplay. The platforming can be a bit difficult though.
You can make the threat that the player is running from more abstract or hidden like a wall of flesh, reaching hands, or blood, something that can connect to the setting in the skybox. Maybe implement something that can disempower the player, since the player is running, maybe a slow? or binding? or make the platform they are jumping to not fully visible?