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I'd played & enjoyed the original Nov 2015 version of 'After School'.

Are there any gameplay differences between the recent 30 Dec 2018 upload & the original 2015 version ? Or is the 2018 version merely using an updated Unity engine ?

It's mostly an update to make the gameplay smoother: the transition between the scenes, the character speed, the dialogue speed and the menus have been improved for a better experience. But the game (story + graphics) is the same.