The answer is not „everything” – the question can be discussed much more in detail, as the Japanese genius himself has revealed all the things he has been doing during the development of Death Stranding.
„I create the theme, the world atmosphere, the story, the character and the game design while making the concept, scheduling, gathering information, doing location scout, experimenting repeatedly, writing the script, deciding the specs, casting, sound designing, putting my ideas in daily basis and adjusting, solving problems editing trailers and even making the key art. That’s my task,” Kojima wrote on Twitter regarding the game, and now, we know how much of involvement he has had during its 3+ year development (as it was announced in December 2015 that he has become independent from Konami, and he has reformed Kojima Productions without them).
These two tweets prove that the director/creator of the new IP did not sit around do nothing (obviously, Kojima wasn’t programming here, but that’s understandable), as he wants his first non-Metal Gear title after a long time to be as good as possible, which is why he plays it every day to fine-tune every moment of it. This also explains why the game was slightly delayed, but we don’t know what the original release date could have been.
Death Stranding, which uses Guerrilla Games’ (Killzone, Horizon: Zero Dawn) Decima engine, will feature several Hollywood actors (such as Norman Reedus or Mads Mikkelsen), and it will be available from November 8, exclusively on PlayStation 4, but there have been rumours about the game not being a PS4-only title. It might get a PC port either in six or twelve months after its initial launch. As the game was announced at E3 2016, it’s about time to hit the shelves, isn’t it?