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hey! I think this guy is talking about the ability to modify the game using the ue4 editor. without spoiling too much, the 'dream' mode is greyed out at the start but you can unlock it by discovering a specific place on the map. this spot is slightly hidden but shouldn't be too hard to find! and yes you're right, the rain mode just acts as a separate game.
I'm super happy that you can enjoy the game in that way! I've got a new project i'm working on that's set in japan, it should be out in a few weeks but if you email me I can send you an unfinished version to try early :)