I would do the hacking system with the mouse. It is a bit difficult to do it with the keys. And in the tutorial, I would put the "zone" where the guys can see you in a different color, so you know (because it is a tutorial) where to move and where to be so they don't see you. I hope you continue working in this game :D
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Thanks for the feedback Janikus!
At first, I deliberately opted out mouse control for this game so that players do not have to move their hands. I am not sure using mouse will help players with the game feel. But I will try to implement it and see how it feels.
I definitely agree with the "detectable zone" concept for the tutorial level though.
I will definitely polish the game a bit more, so thanks for the feedback, ^.^