Hi, and thanks for checking out the game!
Sorry about that, I'm afraid that it's a bug. Are you running on a ultrawide screen or something with a high aspect-ratio by chance? I believe the screen boundary check code is problematic and stops you from moving past the wrong y coordinate in those cases. Fiddling with the HTML container to force the width to `960px` should serve as a workaround. Didn't want to touch the submission while the rating phase is still open :/