SGDK Gameplay

Help make a playable game loop on the Mega Drive. Preserve the project's architecture; SGDK does not require a scene tree, physics engine or entity system.

Start with the existing update loop, target region, coordinate types and object ownership. Identify one behavior to prove, such as a player stopping at a wall or a bullet slot becoming reusable after a hit. Keep gameplay state testable without the renderer where that helps.

Choose the right reference