I’m building a level-based mobile game where players listen to short sound clips, decide what they hear, and earn an accuracy score that either unlocks the next, tougher story chapter or sends them back for another try. The overall look should feel light and cartoonish, and the experience must run smoothly on both iOS and Android from a single codebase. Here’s what I need from you: • A playful, cartoon-inspired UI/UX that scales well on a wide range of phone sizes. • A cross-platform front-end (React Native, Flutter, or another approach you recommend) that handles audio playback, animated transitions between levels, and real-time score feedback. • A secure back-end with APIs for user accounts, level data, answer storage, and the score algorithm. I’ll provide the server—just supply well-documented code and database schema. • Data persistence so progress survives reinstallations and can be analysed later. • Clear estimates of development hours for each major milestone so I can understand overall cost before we start. If you’ve shipped gamified apps with audio components, adaptive difficulty, or cross-platform cartoon games, I’d love to see examples. Let me know your preferred stack, how you would divide the work into sprints, and the total hours you expect the project to take from first sprint through store submission.