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I would love to, however, Apple does not allow UI that is too similar to the iPhone home screen. I am trying to make it similar without it looking too similar.

You already can, hold down on the Like button to add a reaction.

This is planned for v5.2

The dark mode is already supported: Go to settings > Appearance > Dark Mode

That's a great idea! I look into this in a future update.

You can. Please head to Accounts Manager where you can reorder all posts.