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I might have to reinstall the game.

One: Which files do I have to keep so that my progress in the game is not lost ?

Two: My game crashes at the end of level 4 and I can't go past that. Can someone post a file with progress made up to level 5 or more so that I can go on with the game ?

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for anyone that might need help with this.

the save files are found in this location

You can download save files from the developer here