No, it's in development and receiving updates on a regular basis. All the content that has been released thus far is available in this version. May I ask what gave you the impression that it's a demo?
Please check the "Summer In The City 0.63 All-in-one - GOFILE" link. You can choose which platform you want to download it for. For Android, download the file named "flipdashitgames.sitc-0.63-1733411073-release.apk". Let me know if you still have issues and I will add another filehost. Could take a while though.