Really hard to predict the trajectories of the rocks with such a small field of vision.
Viewing post in Sky Jogger jam comments
True but trajectories are hardly the core difficulty of the game, as every rock has the exact same when they appear (the only thing changing is their position). Besides, giving the player a bigger space would make the game a bit easier but also more boring; it is meant to be fast-paced and having you run straightforward for several full minutes would slow the pace down and make the game feels less fun.