Simple, with some hidden complexity in being able to double jump/walk off a ledge and jump, but I'm not sure if that was intentional. I found it really satisfying to plan a route that involved walking off a ledge, immediately turning around, and jumping mid-air to reach some juice that I otherwise couldn't have gotten without touching a crab or progressing too far forward.
I unfortunately softlocked myself on a level after throwing myself off a ledge and clipping through the floor, falling endlessly into the void :( still, good entry!