It would go on to later influence many other shooter games, the game's
unlimited ammo allowing for a satisfying break - neck pace, and its isometric perspective facilitating an appeasing field of view that would later form a primer for the 3D games to come.
Not exact matches
It
allows you to enter codes and get
unlimited lives,
unlimited ammo, invincibility, and other secrets in games.
Achieving all skill shots with a single weapon will even give you
unlimited ammo for that gun,
allowing for a veritable bullet storm.
After I beat it a New Game + mode unlocked which let me carry over my maxed out character and
allows for cheats (like
unlimited ammo) to be used in the game without effecting achievements.