Alto's Adventure has the whole package (like Monument Valley! You should check that out if you like this!). It includes charming animation, a beautiful soundtrack and is very addictive. Worth the price.
This game is EPIC! It is super easy to get the hang of, as for violence there's soooo incredibly little that you could say there's none. This game is a 'Premium' game, meaning it isn't free to download, but there's no in-app purchases, or ads. Age 7+ For one scene where a character with a whip will chase after you, but if he gets you no graphic violence is shown.