I honestly would have never expected something of this level of quality to be capable on newgrounds. The artwork was sub-par, one of the best I have ever seen on newgrounds. The voice acting was enthusiastic, and well portrayed for both the grandfather and grandson.
The music was clever, funny, kind of sad towards the end, and just all around had a great kick to it. A tale of greed leading to tragedy / robo-genocide, leading to revenge, leading to deception and downfall, and then back to soon to come revenge. Had a dark feel while still keeping that uplift of the song sung by the grandfather to it.
Pretty much to sum this all up, this is a perfect kind of flash. Has everything you'd want in a flash: action, comedy, emotion, great music, great artwork. Phenomenal job, James Lee.