Hello! that happens because you don't have the "www" folder. It comes in the instructions, in a text document. READ.txt. You have to have "SkelerBoy.exe and the" www "folder in the same location ... otherwise you won't be able to save the game. You may have copied SkelerBoy.exe to your desktop, and you don't have the www folder. I hope so solutions, any other questions here I am :)
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Thank you very much for your comment! hopefully a second part of Skeler Boy is possible :). I'll keep it in mind, I didn't know that the folder can disappear: o ... But I'll leave a note on the itchio page, explaining that you just have to create a new folder called "www" in the same location as the executable. and ready! :)