Coaster Town can be played with other people. Your theme park has to be the best in the world.
Coaster Town's main goal is to have fun. It means: getting the most out of this game and just enjoying it. When you build, destroy, or finish in-game jobs, you get level-ups.
Which things you can use depends on your level. Most of the time, you don't get things you can't use unless you pay for them. When you play Coaster Town for a while, you'll have enough coins and XP.
You build a theme park, then. In each park, there is a room where you can trade with other people. You can trade and build parts of a park to get coins (Chips) in the game. You'll feel better if more people come to your room.
Have fun and good luck!