physios/ZBEngine ? reverse-engineered prompt

Build me a simple cross platform game engine starter for a zombie survival game called Zombocide.

I want it set up so it runs on desktop and Android, with a shared core for game logic and a place for assets. The app should open to a basic playable scene, even if it is just a placeholder for now, with a main character, some simple movement, and a clean way to expand into a full game later.

Please make it feel like a real engine rewrite, not just a blank template. Include the basics needed for a game loop, loading assets, switching screens or states, and keeping the code organized so it is easy to add things like enemies, UI, sound, and menus later. If you need current setup details or best practices, look them up online and follow whatever fits this project best.

Keep it lightweight, readable, and ready to run from the existing project structure.