Interesting. Great comment on the human condition.
This game is not fun; however, if you are familiar with the myth for which the game is named, you should not expect it to be fun. The developer has asked you to spend $.99 to repeatedly roll a boulder up a hill. In a Flappy Bird-style score mechanic, your score is based upon your willingness to continue a monotonous repetition of taps that move your boulder up and over the hill. The skill required for this is very limited. Patience is much more important.
The trick: you can't stop if you're pursuing a high score. There are no levels. Just a strength meter that increases (+1) every time you successfully push the boulder over the hill, and a stoicism meter that increases at a trivial rate (+.2) every time you fail. Your score is multiplied by both numbers after you fail. Your stoicism carries with you when you fail, but your strength resets.
This game gets brutal fast. There is no relief as you attempt to achieve a high score. Just the unforgiving fact that your failure is only inevitable if you choose to give up. However, you will give up, so failure is inevitable.
Great game.