Brings back memories of old sim games like Theme Hospital.
The basic gameplay revolves around building things in order to make customers happy, so that you can make more money to build more things...
It reminds me a lot of Theme Hospital (and Sim Theme Park, etc...), where each "level" involves minor new obstacles/challenges that require you to build some need item that becomes available. Various scenario modes also add a bit to the variety.
Overall, the game is okay on its own, but is a great diversion. Add to the fact that it's pretty cheap, and it's fairly easy to justify buying it. Plus you can always play the demo for free to see if you like it.