I cleared the first 2 "stages", but when i go with Psycho and try to Hack the first "hackable" door of the game, Psycho remains still and i can't proceed.
How can i resolve this issue?

Switch "Interact" key back to default key, "F".

edit: Switched Use to Interact

Thx a lot it worked!
I wonder why they haven't fixed yet such a "simple" bug.

Np. Wondered the same myself. I actually reinstalled the game because I thought it was corrupted somehow.

Then remembered another game with a similar bug.