Hey mate,
Well the biggest issue I'm noticing right now is that your guy's lips are almost entirely syncronized with your guy's teeth. This makes for very rigid lipsync, and many of the words don't seem like they're being pronounced properly.
A good example would be at "kill him". He should be showing quite a bit of upper and lower teeth at "kill", and then at the end of "him" his lower lip should move up to entirely cover his bottom teeth, and press up against his upper lip, to really sound out the "M".
Follow through with the same principle on the rest of your phenomes and you should be set