Moderately wounded

The screen will change when you take damage from enemy attacks.
Damage heals naturally over time.
But take too much consecutive damage and you will die, resulting in the Game Over screen.

Critical Wounds

When critically wounded, it becomes more difficult to heal damage, and the first aid icon will appear.
Withdraw to a safe place, then perform first aid with the button.

First aid icon

The Game Over screen appears in different situations, such as when the character you are controlling dies or your mission fails.