Source

Fotonica is a running game which I've downloaded years ago. I still play it up till now and always download it on my phone in case I change phones.

It's a really simple but cool game. You just have 2 controls. Press+hold or Release.

Pressing and holding makes the character run or fall down (if in the air), and releasing your hold will make the character jump.

You need to get the proper timing when to release your hold and when to press while in mid-air so you don't fall down endlessly into the abyss that's underneath.