Nice build of piano melody you've got there, but making the notes last longer (if not echo a bit) would make it a lot more powerful, especially when you've chosen the theme of vengeance. Staccato notes just don't have the punch for such a setting. Also, replacing the drum sound that comes in at about 1:43 with something else, such as a kick, would greatly improve the atmosphere of the song, when it's taken into account that this sounds something between a rim-hit and a muted conga (it makes the song feel a bit softer than it could be). Adding a bit more bass to the guitar riffs would also make them pack more punch, thus adding greatly to the overall feeling. Since these are all pretty much technical complaints, I gave you a 4/5 and an 8/10, because this could really be a great song if you made some minor tweaks. Nice job.