The current title is merely a placeholder.
"Save Rooms" are a gameplay mechanic in Bloodstained: Ritual of the Night. They are special rooms scattered throughout the various stages that conform the game in which the player can save their game while also restore their HP and MP to full.
A large room with a long chair at its center where the player can rest their weariness. The player can sit on the chair by pressing ↑ on either the directional pad or the left thumbstick, at which point both their HP and MP bars will be fully restored while also being prompted if they want to save their progress.
Enemies cannot be encountered inside of these rooms.