Agreed, voices aren't necessary for first person games which looking at the video this one may not be. My experience is that with third person games there is a lot of talking and NPC character interaction that without voices will be texted in voice bubbles or at the bottom of the screen in which case you end up not "playing" a game but "reading" it. Non-professional voice acting is better than no voices at all IMO. So what game is this, first or third person?
"Don't Hate Me Because I Am Beautiful...There Are Many Other Reasons!"