Kerfline isn't released yet. When it is, this page will carry the common fixes.
Get in touch
Email mohammad.s.nabulsi@gmail.com — bug reports, a level that seems genuinely impossible, or anything to do with the leaderboard.
Deleting your leaderboard entry
You can erase your display name and all of your runs from inside the game at any time, without contacting me. See the privacy policy for what is stored and what erasing removes.