How is it? is it comfortable? I see in the steam page it has a "partial controller support", that why I ask

It works fine with Xbox controllers, but if you're using PS/generic gamepads, it might not work properly.

Thanks. I'm using the PS4 one, but I never had any problem thanks to DS4Windows.

I hope it doesn't just emulate the mouse by using the right stick or nothing similar, I prefer snaping to items instead.

Ah! It has an auto switching mode for whichever controller is last activated:

1) If the mouse is moved, it goes into standard point and click mode
2) If the keyboard is used, you use WASD to move, and spacebar to activate stuff (you can also emulate this if the actual gamepad doesn't work)
3) If the gamepad is used, you use the right stick to move, and the face buttons to activate stuff.

In both modes 2 and 3, everything switches to snap-to-valid-objects/options only, and for dialogue options, pressing space/facebutton auto triggers the only option if there is only 1 available.

Great, thanks!!