I believe it's a videogame, so what I imagine is going on is that people are working on it, most likely 5 days of the week, or commonly called a work week. During that period the developers (that's what we call people who are involved in the videogame Making process) will each be tackling their own individual roles usually based primarily on their expertise in that field of work. Eventually when the product is complete enough in a state that the team feels is ready for public consumption after QA testing and bug fixing they will release a build live to the world for you and everyone to purchase, install and play