It's not a difficult game in that it doesn't require any special skills from the player. It's more of an endurance game, you could play this for days, if you had the endurance to do so. With the lack of music, the game almost like presses you to make a mistake. I don't know who the giant running after you is, but they act as a clever way to implement lives for our main character.
I'd like to invite your game to our contest, the Game Development World Championship!