How do I make a game like this.

is there any tutorial in youtube to make a game like this goo.gl/aG2dRU ? it would be very helpful

There isn't but you can break it down into simpler problems.

The first is to have an object follow a defined path. There are a few solutions you can find with a forum search, including some behaviors to help out.

The second problem is to position an object an radius from another. Again a forum search for orbit will come up with a few ways.

Here's one possible implimentation

https://dl.dropboxusercontent.com/u/542 ... ollow.capx