Trying to make a wakeup light

Hi All,

I am a total newbie at Yaml and i am trying to create an alarm with Wakeup Light.

The alarm part and turn on light is working.
now i want to increase the light per 50 secs

alias: Test - Wake up Alarm
description: ""
trigger:
  - platform: time
    at: input_datetime.wake_up_alarm
condition:
  - condition: state
    entity_id: input_boolean.wake_up_alarm_toggle
    state: "on"
action:
  - type: turn_on
    device_id: da57d2d981fcde049009a1a18af46f63
    entity_id: light.lamp_woonkamer_tv
    domain: light
    brightness_pct: 1
repeat:
  count: "10"
  sequence:
    - type: brightness_increase
      device_id: 2d4fe0c72716b7addc00111338dd5413
      entity_id: light.lamp_woonkamer_tv
      domain: light
      - delay:
        hours: 0
        minutes: 0
        seconds: 50
        milliseconds: 0
mode: single

when i try to save i get the following Message:

Message malformed: extra keys not allowed @ data[‘repeat’]

Does anyone know what i am doing wrong?

the goal is:
Turn on the light and within 5 minutes the brightness should go from 1% to 100%