Cross-Platform Reward Game App

I want to build a mobile game inspired by the look-and-feel of GravFort Nexus and release it simultaneously on iOS and Android. The concept revolves around a reward-driven loop where players collect incentives—think coupons, power-ups, or virtual currency—as they clear levels, hit milestones, or complete daily challenges.

Scope
• End-to-end development: gameplay mechanics, UI/UX, artwork, sound, server-side reward logic, analytics, and in-app purchases.
• Cross-platform delivery: a single code-base that compiles cleanly for both the App Store and Google Play without feature discrepancies.
• Backend portal: a lightweight web dashboard that lets me configure rewards, monitor player stats, push events, and manage ads or promotions.
• Polished launch package: TestFlight and Play Console builds, store-ready assets, submission assistance, and post-launch hot-fix support for at least 30 days.

Tech
Unity, Unreal, or any comparable cross-platform engine is fine as long as it hits 60 FPS on mid-range devices (iPhone 8 / Android 10) and supports in-app purchase libraries, ad SDKs, and Firebase or a similar analytics stack.

Deliverables
1. Production-ready iOS and Android builds
2. Full source code with build instructions
3. Reward management dashboard + API documentation
4. Asset bundle (art, audio, fonts, icons)
5. One-page style guide and gameplay flowchart

Share two or three live titles you have shipped that highlight similar reward mechanics or real-time gameplay, outline the tech stack you propose, and break down your timeline into milestones from prototype to launch.