Definitely more on the challenging (not to say, frustrating) side, but I guess that this is on purpose. Really gets your heart pounding, running through the level, unable to stop, risking getting hit every time you try to switch directions.
The hit detection maybe could use some more fine tuning. Sometimes it felt as I was hit by the ball when it shouldn’t have. Maybe it actually did hit the player, but in those situations, it felt a bit unjustified and overly punishing. But overall an interesting and challenging mechanic