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

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

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

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

: Design a progression system where defeating bosses yields new sub-weapons (like origami or anti-demon tools) that open new navigational routes, similar to classic Metroidvania titles. System & Utility Features

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