Lights Out
It's so dark...This mod removes pretty much all the lighting built into the levels. If you don't have a headlamp or a flashlight on you your entire screen is just pitch black. So, uh, I recommend you to take the headlamp trinket.
To compensate for this lack of lighting, the range of the headlamp and flashlight is slightly increased to make the game more fair. However, the flashlight is dimmer and thinner. Additionally, flares are actually pretty darn useful for finding your way through dark wide open areas. The light from flares shines twice as far compared to how it did previously.
This mod doesn't disable leaderboards because why? It's technically purely visual lol.