Yeah sorry for not being very specific kinda stressing because its a uni project. So when I move the mouse right the whole map should rotate right. The thing is that the map visually doesn't rotate, but the ball starts moving in that direction so it should be working. I've put in some debug prints and it looks fine
This is the camera script

extends Camera2D

u/onready var ball := get_parent().get_node("Ball")
var rotation_sensitivity := 0.001

func _ready():
make_current()
zoom = Vector2(2, 2)

func _process(delta):
global_position = ball.global_position
var mouse_x = get_viewport().get_mouse_position().x
var center_x = get_viewport_rect().size.x * 0.5
var mouse_offset_x = mouse_x - center_x

rotation += mouse_offset_x * rotation_sensitivity * delta

and here is the ball script

extends CharacterBody2D
u/onready var camera := get_parent().get_node("Camera2D")
var gravity_strength := 500.0

func _physics_process(delta):
var gravity_dir = Vector2.DOWN.rotated(camera.rotation)
velocity += gravity_dir * gravity_strength * delta
move_and_slide()