I think narrow at the start and open later on is the most fun.
What is a bit annoying is when you have 3 screens in location one, then you move on to location 2 with 5 screens, then location 3 etc. It tends to feel like those "escape the room" puzzles instead of an adventure. Also, when you have only one objective, if you get stuck you cant do anything more. It's nice to have a few objectives that you can work on at a time.
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