Action-Adventure PC Game Development

I’m creating a story-driven action/adventure title for PC and need hands-on help with the actual game development. The core concept, narrative outline, and basic gameplay loop are sketched; what’s missing is the technical and creative muscle to turn those ideas into a playable, polished experience... (Budget: $15 - $25 USD, Jobs: Game Design, Game Development, Gameplay Programming, Level Design, Mobile App Development, Unity, Unity 3D, Unreal Engine)