I'll give this one a six again, for the same reasons as I did with the fourth in the series.
That said - one further thing to I do like is the variations in color throughout the levels; one further thing I dislike is the fact that you can only interact with the ball when it's at rest now. I imagine this may have been considered a bug in 1 and 2, but I enjoyed being able to play with the ball and give it further pushes while it was still in motion.
All in all, I hope there's gonna be a 5. Maybe one that has a "relaxation mode" in addition to normal gameplay, too, where bombs and holes are gone?