how do i do this

braincell.gd

@@ -0,0 +1,25 @@
+extends CharacterBody2D
+
+
+const SPEED = 170.0
+const JUMP_VELOCITY = -400.0
+
+
+func _physics_process(delta: float) -> void:
+	# Add the gravity.
+	if not is_on_floor():
+		velocity += get_gravity() * delta
+
+	# Handle jump.
+	if Input.is_action_just_pressed("ui_accept") and is_on_floor():
+		velocity.y = JUMP_VELOCITY
+
+	# Get the input direction and handle the movement/deceleration.
+	# As good practice, you should replace UI actions with custom gameplay actions.
+	var direction := Input.get_vector("left","right","up","down")
+	if direction:
+		velocity = direction * SPEED
+	else:
+		velocity = velocity.move_toward(Vector2(0,0), SPEED)
+
+	move_and_slide()