Learn to Fly

Learn to Fly is from the Learn to Fly series, gaming's definitive answer to 'can a penguin achieve flight?' Launch off a ramp, glide as far as physics and your gear allow, then spend your earnings on rockets, wings and sleds to go farther tomorrow. The upgrade loop is flawless and the penguin's grudge (canonically, against the phrase 'flightless bird') is eternal.

Everything runs on keyboard and mouse; give it one round and the controls disappear into muscle memory. Phone, tablet or desktop, it runs the same, so you can pick up where boredom finds you. It supports fullscreen, which is worth using once things get serious. Come for the curiosity, stay for the personal best.