Gone through your requirements to fix issues in your mobile apps that are live on play store issue like fix enemies spawn, etc and I assure you that I will complete this project within your timeline and start the project right now.
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I am a Android developer with more than 4 years of experience and expertise in adding addmob, java, android studio, etc.I can show you my work once we discuss more and than we can move forward if you like.
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Looking forward for your positive response.