There are 4 tasks that have the sum of 25 points at the end. That is the basic gameplay. The other 15 points are 2 tasks you did not found yet. One is a hidden easter egg. And the other is that which most players always skip when they start to play.
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Thanks. I was very thorough, so I have no idea what those hidden tasks could be. I'll revisit this after I've played the other games in the jam.
EDIT: Aha! I have to do the tutorial task before starting the game. Now to find the Easter egg.
EDIT 2: I give up. I tried systematically clicking every item in every room and most combinations of items and I couldn't find any Easter egg. Maybe it's a command-prompt only thing, but I was never able to enter any commands that did not have a hyperlink equivalent.