The modern Switch release includes three distinct versions of the game:

In this form, you are generally . Taking hits in Shin mode reduces your energy gauge instead of a life. The "Shin" Mode Katana System

An updated "home" version with a 16:9 aspect ratio and the Katana system .

Higher movement speed, but weaker option fire.

A re-balanced version of the original arcade game, optimized for 16:9. Core Gameplay Mechanics

Activated by pressing the once the Guiding Gauge (green bar) has energy.

This mode replaces the "reflect" system of the arcade version with an aggressive scoring and bullet-canceling loop: Akai Katana Shin Review - Nintendo Switch