5/5, plus an extra 1 for the bold move to not include some stupid tutorial for dummies. A logical game where your progress is directly linked to your effort to advance AND to figure out the rules by yourself deserves just as much :) Two things I would add for replayability, or for future sequels - 1) Random generated lvls and 2) Statistics of performance at the end of the game (like responsiveness, needs to scroll up, command repeating, typing speed, task time etc.)
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Thanks for your comment and your suggestions! We'll take it in consideration :)