Thanks for reporting this, and sorry it happened. We have logged it as a bug. Two details would help us find it: were you on the farm or on a raid when the keys stopped, and had you clicked anywhere outside the game area just before? The farm saves in your browser, so reloading the page and choosing CONTINUE should bring the keys back without losing your progress. We will reply here when a fix is live.
Thanks, that detail helps. Clicking outside the game frame moves keyboard focus to the itch page, and SEEDLIFT has no code that takes focus back, so that fits what you saw. We've added it to the bug report. Until it's fixed, try clicking on the game once. If the keys still do nothing, a reload brings them back and CONTINUE picks up your farm where you left it.