My feedback: I appreciate the ambiguity of the voice, its easy to hear and I like the inflection taken. If I had to change one thing, there was a brief period where the voice sounded a bit lighthearted, and I'd just make that a more consistent sinister threatening sound. Other than that, good work!
I don't think I'd accomplish much with a retake if it's just the brief moment, but I'll keep that in mind.