Build a unity mobile game, real-time, multiplayer

Job ID: 32479710

Budget: $12,000 – $24,000 HKD

I need a 3D online game on mobile phone which is online and real time for user to trade items and level up their pets. Just like a farm game but online.

Feature and system as below:
- 3D game is expected.

- game on real map, like GoMap.
Reference: walking dead:our world
But player can move around using screen controller instead of moving in real world.

- multiple player on the same map real time. All on a shared session to see other players movement nearby and to interact, instead of separate game room for 6 or 10 players.

- pet system. Player can raise numbers of pets. Pets number would be increased with players level, like 1 pet at begin and 10 pets in 100lv. Each pets can level up by gaining XP to enhance its ability, like carrying items, attack damage.
Reference: Roblox : Bee swarm simulator

- fight enemy (Npc creature) on map

- inventory system. Player can sell and buy items. Price would be varied in different district for player to make profit.
Reference: Gersang

- player can build and upgrade shop and factory on map.
Reference: orna

Please include in your proposal:
1. Prototype price (demo for each function and system, but not all items all location)
2. Full game price
3. Your job reference
4. Any query or suggestion.