: You may want to include "Pure" (Japanese) and "Refined" (English) audio options for story and action dialogue.

: Include an unlockable mode for players to challenge all bosses consecutively after completing the main story.

: Offer multiple playstyles such as Casual (unlimited lives, no knockback), Veteran (limited lives, retro difficulty), and Legend (unlocked after beating the game).

Are you looking to develop a for the game or are you building a similar title and want to replicate these specific mechanics?

: The game is designed for 64-bit Windows systems (10/11) and requires approximately 5GB of storage.

: Enable a drop-in/drop-out local 2-player mode where each player controls one sister simultaneously. Development Requirements

: Develop a system where, if one character falls in combat, the player can navigate the survivor to the fallen sister's location to resuscitate her and continue the fight.