Request to Build Android Mobile Game

Hello, I need a developer to design and build a mobile game for Android platform with following specifications: 1- The required game is based on the existing "Alto's Adventures" published mobile game. This includes having same controls, graphic, and motion. 2- This job includes design of all the graphics, programming, and quality control. 3- The game's setup is for a kid riding hover-board instead of snowboard, it will be in the city instead of mountains, the kid will collect stray dogs instead of lamas. Other than those changes, remaining setup is same. 4- Freelancer has to build only 10 levels of the game. The difficulty increases with each level. The game has to loop back to the first level after completing the tenth level. 5- Unlike Alto's Adventures, no need to have different characters (i.e. avatars) in the game, just one kid is enough. 6- Ads platform to be implemented is Google Admob 7- Google Play Games platform to be used to see the ranking of players based on their score 8- Deliverables include apk file with its signature, and development project file. 9- The freelancer has to propose the milestones and estimated cost for this job in his proposal. 10- Freelancer has the freedom to select his preferred game-engine to build the game. 11- Freelancer will be paid per milestone, but final amount at the end of the project will be paid after ensuring the quality of the deliverables. Deadline to complete the job is three months. Freelancer has to provide technical support for six months after publishing the game.