This app was mentioned in 2 comments, with an average of 2.00 upvotes
~~Vector Full (£0.89 -> £0.10)~~
This is the Google Weekly Deal and is £0.10 in the UK
The Google Weekly Deal is only ever available in certain countries (the USA never receives the full discount that other countries get, roughly 98% off). Commonly included countries are Australia, Austria, Germany, France, Italy, Mexico, Netherlands, Poland, Romania, Russia, Spain, Switzerland, Ukraine, Turkey and the United Kingdom.
Possibly Vector (also has a free version). I'd call it a 2D Endless Runner game, but your character learns different moves and if you execute them correctly you do better. So it's a bit more involved than just tapping to jump you run into in some 2D runners.
If you prefer the one tap jump, you might like Space Chicks. Your character jumps from one asteroid/planet thing to another. Once you land, your character continues to run in a circle around the planet. You have to time your jumps to get where you want to go.