This, basically:

The developer(s) of Half Life 2: Overcharged pulled a sneaky on youtubers who dissed the mod, someone found out about it by decompiling a dll, then one of the youtubers revisited the “updated” mod by listing every single bug he could.

The most common issue was the “leaking sun”, which I don’t think I can explain better than a video could other than saying “the sun leaks”.

As for the image on the right: it’s just vanilla Lunacid lore.