In my own experience playing the game, they feel exactly like different stories. I'm only following 6 routes (no Eve sub + Cassie, no Cassie dom, no neutral/hate), and each one feels different from each other. By example, both Eve sub routes feel like different characters are involved. Some routes have converging story points, but the characters are the ones who feels different in each one. And each route is very interesting itself. It must be a nightmare for the dev, although
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And once it's finished, I still got 9 more plays to do if I wish