Just a quick update: I’ve now added tile selection export, the reference image panel, and color palette improvements (import/export + extract from image). These are all included in the latest build and are currently awaiting App Store review (both iPad & mac version).
Really glad you’re enjoying the app so far — it means a lot 👍
The other things you mentioned are closely tied to the app’s core, so they’ll take a little longer to implement, but they’re definitely on the list.
edit: it's now been approved! :)