A demo is not a placeholder. Demos are meant to show you the game's mechanics, and give the player a reason to be excited.
So far, this is looking like so many modern iPhoney/Facebooky games: a grind. The rewards are small and fairly frequent (thus making them addictive) but promotion requires zero skill. That turtle catapult game has more skill. This is not a "Tycoon" game. It is a "tap X" game.