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A good rule of thumb is that if you have to scroll through an entry, it's too long.
Having read the entry, though, I think it's mostly fine. I would just cut down on the mentions of the gameplay mechanics, since that's not what gives a game Darkness-Induced Audience Apathy.
For example, the first two sentences in the bullet-point about the first mod are mostly about ways that it's not dark and oppressive. They also mention how it's mechanically similar to the original Half-Life, which is irrelevant.
There's also the issue of Example Indentation in Trope Lists that needs some work.
The first bullet should be something
- "Halfquake"
Or
- The Half-Life mod trilogy "Halfquake"
With everything else being under a second level sub-bullet, including the spinoff entry, in my opinion

I've remade the Half-Quake entry over in Video Games, due to the entry I made before that being way too-run on and inconsisntent. I want to make sure I'm avoiding word-cruft and overly emotionally-charged content. Here's the entry I made so that way if there's any errors I've made, either regarding typos or not following the Rule of Cautious Editing Judgment, it'll be here and not in some awkward place.