Hi. Hope you are doing good. I have checked your pdf, so basically you want an apocalyptic runner game with different types of obstacles and 15 minutes gameplay for your game levels.
I am a unity 3D developer and i have a team of developers and designers we can surely help you out with your endless runner game. I have seen the reference graphics aswell, are your assets and models ready or we need to do models and buildings etc aswell? Kindly initiate chat to discuss the project in detail. Final quote will be provided once exact requirements are clear.
Detailed portfolio can be shown over chat.
Regards,
Asad