Online Number Game Platform Development

I am building a web-based, number-driven gaming platform that feels bright and colorful on every screen yet remains lightweight enough to load instantly on mid-range Android phones.

Core features I need you to deliver:
• Phone-number + OTP registration and secure login
• Player wallet with UPI-QR deposits, balance updates, and a withdrawal request flow that I can confirm manually or semi-automatically
• Intuitive number-selection screen where users pick their numbers and submit entries in just a few taps
• Result module that lets me publish winning numbers on schedule or enter them manually, then pushes notifications and updates leaderboards
• Comprehensive history pages for past draws and each user’s activity
• Responsive admin panel to view users, adjust balances, manage entries, and process withdrawals quickly
• Fully responsive front-end that functions smoothly on Chrome for Android

Tech decisions are open, but I want a fast, simple UI (React, Vue, or similar SPAs are fine) and an easy-to-navigate backend (Laravel, Node, or comparable frameworks). Clean code, commented where needed, is a must.

When you reply, please include:
1. A working demo or relevant screenshots
2. Estimated cost broken into milestones
3. Realistic timeline from kickoff to launch

I’m ready to move quickly once I see a solid plan.