Created a room map generator. Small squares indicate the exit from the room.

Light gray and dark gray rooms are the rooms of the corridor zone.

Red rooms are "end rooms". These rooms are used only if other rooms cannot be spawned.

When the game starts, all rooms are spawned and go into the pool of spawned rooms. The display of spawned rooms is immediately turned off. Then, when the player enters (or appears) in the room, then when neighboring rooms spawn, a room from the pool is taken, it is transferred to the desired place and turned on.
github: https://github.com/Shin0kari/FrozenBunker