First of all, you are right about the sound quality (a bit low), but I have to say that the voiceactor did a good job (for example when he said "time is on my side" he used a very subtle nuance in his tone).
Your visual artist used rather unusual techniques for the graphics, I personally like that style, an original way of drawing which I haven't seen in this quality before.
Since this is "just" a trailer I can't make a final judgement on the story, what I hear so far sounds interesting. Some elements (Virus Outbreak, Timetravel) are a bit overused in the movies, but that's no reason why you can't give this storyline a unique touch!
I really, really hope you can put the different storypieces together and create a imaginary world of its own - as far as I see it you got the talent to do so.
Good luck with the project, for what I can see so far this is going to be something I would like to watch :-)