I agree with you, although I don't think that is the case for this game, He uses the same images over and over. As it is not a linear game, where each scene happens only once and is not repeated, it is used the same scene several times, until it reaches a trigger, and so it releases a new scene, and starts all over again. If it were a linear game, I don't think it would give 10 gameplayer mitutes. In short, I think there is a little laziness there, and maybe a milking.
Think with me, I'm a developer, there's a guy who pays me $ 20 to deliver an update a month, so I'm going to get $ 20, right?
Now, if I take two months to deliver an update, I will receive 20 from last month and another 20 from this month, which would be $ 40 for an update, right?
Now I ask you, which is more advantageous for me?
Of course, it's just my thoughts.