Ocmo is a challenging physics-based platformer that casts you as an icky tentacled creature out on the rampage. The game has you tapping the screen to attach one of said tentacles to the nearest surface, pulling your character forward.
If you feel modern mobile games are too light and easy, give Ocmo a spin. It's deceptively hardcore, and it looks great to boot.
At the other end of scale to Ocmo is Eden Obscura - a free-roaming audio-visual extravaganza that's more of a beautiful toy than a rigid game.
Swing around a psychedelic garden, growing new plants and spacing out to a trippy electronica soundtrack. It's from the team behind the PixelJunk console game series, if you needed any further proof of its quality.
Laser Dog's endless runner doesn't play an awful lot like Hang Line: Mountain Climber, if we're truthful. But it is similarly charming, and its protagonist is also fond of unorthodox modes of transport.
In fact, one of those optional contraptions is a yo-yo that serves to swing you forward in familiar fashion.