You can delete the old ones! Saves are stored in APPDATA folders, so it won't be bothered by deleting old versions of the game.
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Thanks for the answer, and for this whole game.
It has been one of the most wonderful reads in a long time, and all routes have been able to pull a lot of emotions from me, Spencer in Darius' route for example made both want to slap him with the might of Zeus and just hug him till the heat death of the universe. Your writing really can pull at ones heart, with positive or negative emotions, in just the right way, so I can't wait to keep seeing how this game grows.