YA Floating city on inhospitable planet. Children explore/work because adults don't fit into spacesuits anymore. Read in 2010s.

[Aric]

Read 2010s may have had some technomancer type characters with mechanical eyes connected through a hive mind.

[Rainbowheart]

Was the city floating in the sky or on the water?

Can you remember anything more about the main character? Male or female? Age?