I will repost the song with markers to help me to show my interpretation:

/1/Life is still spinning/1/
/2/Your end, my beginning/2/
/3/And everything I hoped for
has been strangely set aside/3/

/4/Reason for living/4/
/5/My mind is forgiving/5/
/6/And destiny is proving to be
absent from my life/6/

/7/I know it, I feel it/7/

/8/I know when you're sleeping/8/
/9/I know the things you're dreaming/9/

/10/And I know
you will never
give up and die/10/

/11/Conscious fulfilling,/11/
/12/the darkness revealing/12/
/13/All thoughts and insecurities
are shining like the sun/13/

/14/Eyes are deceiving,/14/
/15/your mind will stop breathing and/15/
/16/all that you are made of
will now rightly become mine/16/

/17/You know it, you feel it/17/

/18/I know when you're sleeping
I know the things you're dreaming
I love it when you're weeping
Even death can't stop this feeling

And I know
you will never
give up and die/18/

Interpretation:

/1/Samantha refers to her life being a mess after she enters in the teleport machine; it can also be referring to the teleport travel including a spinning spiral, so she could be kind of "dizzy" by this./1/

/2/Samantha might be referring to her father's death, as if she was saying: "your time ended, now mine begins"; it can also refer to the zombification of a recent corpse, once that minus one survivor means plus one zombie./2/

/3/Samantha, when went inside the device, apparently lost much of her human wills; it can also mean that everything that she expected to her life was subtly interrupted by entering in the teleport./3/

/4/Samantha is powerful a lot now, maybe she has no idea of what to do with all this power of her; her motivation is vengeance, but what will she do after?/4/

/5/It could mean that Samantha was willing to forgive the survivors, but it's visible that she hates them. However, she says "my mind" and not "I" or "me"; as if the forgiveness feeling comes to her, but she simply doesn't care for it/5/

/6/Samantha is now so powerful that she doesn't even care about destiny anymore, she probably thinks that it wasn't destiny that brought her to inside the device; now she makes her own destiny./6/

/7/She knows it and she feels it, a hook to the next strophe./7/

/8/Another power demonstration. Samantha is so powerful that she is able to know, at anytime, when the survivors are sleeping./8/

/9/She is able to enter in the minds of the survivors and to know their darkest, deepest and most intimate desires; she knows what they dream./9/

/10/Even hating the survivors, she reckons and admits their persistence in keeping themselves alive./10/

/11/Samantha's conscious desires and actions are quite clear, she wants to get revenge from all those who had to do with her father's death; and she fulfills these desires by throwing hundreds of zombies over those involved in it./11/

/12/The device wakened her darkest and obscurest side of her, and this darkness goes revealing itself more and more./12/

/13/This might be about the survivors' "thoughts and insecurities", which are very visible as the sunlight to her./13/

/14/"The eyes being deceiving" probably makes reference to something that is not what it looks to be, which leads to various interpretations. Possibly it's about the survivors. Maybe about them thinking that the zombies are still people and have somehow a way to "back to normal", or maybe it being about they thinking that the zombies attack randomly instead of being controlled by someone, or even about them having an escape from the zombies. Its hard to say what it means./14/

/15/She speaks that the survivors will die one time or another, stopping every breathing and mind activity of them./15/

/16/Samantha is the zombies and the zombies are Samantha. Once that the survivors are dead, they'll be part of the zombies; therefore property and part of Samantha./16/

/17/The survivors slowly start to feel the power of the entity controlling the zombies, slowly they start thinking that they might really end up dying to zombies./17/

/18/She repeats and complements the previous chorus. She sees the suffering of the survivors and enjoys it, a so strong feeling that even their death cant stop it./18/

/19/She possibly makes reference to a part of The Bible (Matthew 27:46), where Jesus, on the cross, asks "My God, my God, why hast thou forsaken me?", but with a bit changing on the words. Maxis, when he was killed, left Samantha alone and devastated, she feels that she has no more life to her after this./19/

/20/This is quite hard as well. Probably it's about how long it's taking to her to avenge Maxis/20/

/21/This part might be another reference to The bible (Revelation 1:18) (I confess that I might be wrong here), where Jesus (probably Him once that the first one was too) speaks that he was alive, dead, and now was alive again. Samantha compares herself to Him, once that she died as well and resurrected inside MPD./21/

/22/Just some repetitions of the refrain's strophes./22/

/23/She reaffirms one last time that she knows that the survivors will never "give up and die"./23/

That's it, thanks for reading