Look around your surroundings. Interacting with an object will progress the story.
I need a spoiler about what to interact with.
Echo-bot's Remote is just down and to the left of Mum. Interact with it.
What's next?
Echo-bot's Remote would be useful. What helped you last time you couldn't reach something?
I need a spoiler about what can help me to get Echo-bot's remote.
Maari can fly. Interact with Maari.
What's next?
You need to get rid of Maax somehow, before you can use Maari.
I need a hint about how to get rid of Maax.
Take a look at Maxx's Personal Displacement Device. It seems to be broken.
I need a spoiler about how to get rid of Maax.
Ask her about the portal and she will disappear. (This only works after you have interacted with Maari. It's the same dialogue option, but a different outcome.)
What's next?
After Maax is gone, use Maari to interact with Echo-bot.
What's next?
Use Echo-bot's Remote on Henry, from the inventory. Control switches to Echo-bot.