I realized as I was typing it out that the easier levels do serve as sort of a break, but it's a balancing act. I think the difficulty in this game was still a little too spikey for me.
Ideally you probably want to have an ever-rising trendline of difficulty that sort of averages out from level to level when you have something really challenging followed by something that feels more forgiving. You don't want to have the hardest bit in the middle of the game flanked by the easiest bits, but providing a little variance definitely keeps it more compelling.