Bugs, missing features, things that behave oddly — all of it is welcome, and it is read by the person who wrote the app.
Write to:
Linkloft copied your version details to the clipboard as it opened this page. Paste them into your message — they say which version you are on and which phone you are using, which is usually the difference between a bug I can fix and one I cannot reproduce.
If the paste comes up empty, no matter. Tell me the version number from Settings → App version instead.
Nothing is collected automatically. Whatever you choose to send is what I get, and nothing else — the app has no analytics and no crash reporting, which is exactly why hearing from you matters.