I have started to develop a small game with Flutter and Flame. However, I have a problem: how can I define a maximum resolution for my game for users who might be on a browser on a PC (since my game is a platformer) so that the experience will be the same no matter how large the screen is?
From reading your comment to the other answer I think I know what you are looking for, and that is the FixedSizeViewport if you are using the CameraComponent (which I suggest that you do), if you are using the legacy camera it is called FixedResolutionViewport.
When creating the CameraComponent you can use the specific constructor for this to have it set up this viewport for you (or you can set the viewport manually afterwards):
final cameraComponent = CameraComponent.withFixedResolution(
width: 800,
height: 600,
world: world,
);