Sienna

Sienna is a simple, albeit frustrating, one-button platformer designed with touch devices in mind.

Sienna was never finished but is still very playable.

How to play:

• Press space to jump or wall jump when touching a wall. The longer you hold the button the higher you jump. It will often be necessary to press the button for only a splitsecond.
• Press R to restart from last checkpoint (counts as a death).
• Press return to restart from the beginning of the level.
• Oh, and the blue orbs are checkpoints. You're gonna need those.
• That and patience. Lots of patience.

http://tangramgames.dk/games/sienna/