Third, we wanted to provide a better overwiew of the map in the screenshots, is it completely necessary to remove most of them
It's good practice to take just a few screenshots that show as much as possible. A picture of a wall with windows/doors on it doesn't really say much about the map at a glance. This screenshot, for example, doesn't really tell me anything. This screenshot of Sunshine, on the other hand, shows a ton of the map at once, giving you an idea of what that space is like.
You can totally include a ton of screenshots if you want, but I'd recommend placing the more informative ones at the top of the list.