Mad Crab Grab is a free online browser game where you make your way from the bay to the sea AND EAT ALL THE THINGS! Also available for Android and Windows 10.
Use a throwing type motion with either mouse or touchscreen to throw the snails into the crab's mouth to keep him from going mad. Its not quite a flick, and its not quite a swipe, but get it right and crab eats all night.
Theres other factors involved but generally:
Snail speed = Swipe distance / swipe time
Some obstacles may be clicked, swiped, or smashed through.
Drag the blue bubble downward to pause the game.