Worked in a Fedora virtual machine 👍.
Very good start. Quite fun. Took me a little while to realise I had to connect all available pieces for the rest of them to start showing up. Good stuff - well done. Would like to be able to make puzzles from my own images.
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Thanks for the comment!
Recently I implemented this mode that you get x amount of pieces and more after finishing them and I found out it's more fun this way - sorting dozens/hundreds pieces on a computer screen is not very fun. You can build puzzle of any size this way.
I still need to add some kind of tutorial/explanation for this.
User added puzzles are the next big feature (and one of the last left todo).