You can't kill opponent with a Heavy Strike.
FIST OF THE NORTH STAR GAME ROM FULL
The character who has been beaten by the opponent's Deadly Fist Blow recovers a full star bar on next round.This ultimate move removes 100% of the enemy's life. At that moment, opponent can perform the Deadly Fist Blow (named Fatal Strike in the U.S version), commonly called Fatal KO. When all stars are removed, the Death Star (Shichousei in japanese) appears under the Great Dipper, and a portrait of the character seeing it displayed in the background for a short time.Every time for super moves requiring Aura.Most special moves and few basic moves on counter hit.Stars can be removed by performing moves in defined conditions.Characters recover one extra star each round within the limit of the star bar capacity.
At The Time Of Retribution, both players receive a full star bar.Here are the rules applied to it as it's a bit complex to understand at first glance. This bar is filled with seven little dots representing the number of stars featured in the Great Dipper. Notice that when you deplete a boost stock, you will have to wait few seconds before you can stock boost again in the bar (same goes for Aura).Bar fills as you hit opponent or get hit, just like Aura.The main use of Boost is to link or cancel moves you cannot normally cancel, resulting in a wide variety of pokes and combos.Using Boost results in making the character perform a fast dash towards him that dash is cancelable with any move. This bar is linked to the button and has 3 levels shown above : purple, yellow and green. As you may have guessed, the main use of aura is to perform supers, but it has other uses you will find later in the FAQ and is also used by few character-specific moves. Once you reach a level, the words "God Fist Blow" appear next to the bar. There are two levels : first one is blue, second one is yellow. Your regular super meter found in every 2D fighting game nowadays. The blue segment of the life bar, after receiving damage from attacks, heals over time as long as your character doesn't jump or being attacked. When that depletes to zero you lose the round. The orange bar on the top of the screen your character's life bars. There's lot of stuff displayed on screen, so let's go deeper to understand what does what.