Launch Me is a launch-and-upgrade game: each attempt is a single throw at a chosen angle and power, and how far you get funds the upgrades that make the next attempt go further.
The loop is deliberately simple, and the appeal is watching a run that ended in twenty metres eventually reach the other side of the map.
Around 45 degrees for raw distance, though once you have air-time or boost upgrades a flatter, faster launch often goes further.
Launch power, air time and boosts. Power compounds with everything else, so it's usually the first thing worth buying.
Yes — drag and release. Nothing to install.