Crowbar Collective has pushed back the release of its Half-Life remake, Black Mesa, because the studio wasn't able to finish the final areas of the game in time for their planned release date. The game was originally set to launch this summer, however, the team didn't meet its internal target and has, therefore, delayed its launch.
The later part of the development process has focussed on the Xen areas, and although Crowbar has greatly expanded the level of detail on offer (you can see what we mean in the screenshots below), that isn't enough according to the devs. The studio has also worked on existing bugs and successfully updated an issue with strange weapon handling animations, and even introduced a dynamic lighting system. Due to the fact that the game is already available via Early Access, you can take a look at their progress for yourself, unless you'd rather wait for it to be finished, of course.
Here's the official statement from Crowbar:
"Unfortunately, as some of you may have already predicted, we are going to need to push back our planned release of Xen to later this year, in December. We know that this is not what anyone would want to hear, but after taking a long and hard look at what we want to achieve, we have decided that this is for the best. We do not want to compromise on Xen's quality in any way. That said, we consider December to be a do-or-die deadline."