Lorenzo: The Grunty Aeronaut (free version)
Sad life at swinery in Lety, where hundreds of piggies lead their miserable lives. One of pigs, Lorenzo, has developed wings as a result of rare mutation. He uses his advantage and decides to fly away from swinery. But his journey is very demanding and you have to help him out.
Lorenzo is adventurous arcade side scrolling game.
Free edition is limited by maximum reachable level, but still challenging enough.