Engaging Roblox Running/Collecting Game Development

Roblox Game — Running/Collecting Game with Progression System
I need a developer to build a running-themed Roblox game with the following features:
Core gameplay:

Main game field where players collect balls/orbs scattered around the map
Running tracks/treadmills placed somewhere on the map to upgrade player's running speed/stats
A long platform on one side of the map that rewards players with coins/cups over time as they run/traverse it

Progression system:

Players use the earned coins/cups to purchase upgrades for their character (speed, stats, etc.)
A separate egg stand/shop where players can also spend coins/cups to purchase eggs (with rewards/pets/bonuses inside)

Additional requirements:

Overall map/field design should be visually appealing and cohesive
DataStore integration to save player progress (currency, upgrades, unlocks)
Leaderboard/stats display
Game should feel fun and engaging, not just functional — open to creative suggestions on mechanics that make it more interesting

Deliverables:

Fully working game mode with commented Lua scripts
Willing to discuss scope/budget based on proposals — payment will reflect quality of final result