The game is quite unique. The overall essence of the game is arcade style. Playing the game involves the control of a catapult that is weakly guarded. As the catapult, you determine its angles and powers towards a small or large enemy base. While attacking the base with the various angles and what-not, a few events could happen such as guards from the enemy castle attacking your catapult guards or gaining +3 stones from obvious targets. You win the level by demolishing every last bit of rubble from the map. After winning, you have the choice to either upgrade the amount of guards you can have, gain an extra stone, or improve stone bounces. You lose if you run out of stones to launch and HAVE to start COMPLETELY over.
It all sounds pretty fun and cool by just seeing pictures of it or reading a small review, but it actually isn't as great as you would expect it to be. Pertaining to the title "Not Enough...", the game doesn't have extra options that include something such as starting at a specific level or have unlimited stones, free play or anything in that manner. If it had awesome things such as challenges, target mode, multiplayer, or so on, the game would be worth every penny and have higher ratings.
For one dollar, the game seems pretty reasonable to the price. It would simply be much better if there was more content than just playing the same game over and over. But that's just my opinion.