Update iOS game - cocos2d

The game is already developed but needs to be updated. Specs summary for the project: - Ensure that all ads & analytics frameworks work properly as designed to be. - Ensure that the game is stable and plays without bugs and rectify respective code elements. - Implement UI feature changes and update sequence of animations. - Update logic of music/sounds sequence. - Align all the game mechanics to arrive proper user experience during gameplay. Please refer to the attached specification file for details. Freelancer has to implement all the requirements as specified above and as mentioned in the detailed specification file. 4 Payment milestones are designed for this project: - First payment 20% will be released once points 1-6 are completed as per specification detailed file. - Second payment 20% will be released once points 7-14 are completed as per specification detailed file. - Third payment 20% will be released once points 15-20 are completed as per specification detailed file. - Forth payment 40% will be released once points 21-22 and all other requirements of the project has been met. The payments for milestones will be released sequentially only. Project timeline is 2 days and needs to be started today.