Does it really matter, though? If an app is in the foreground and using a lot of RAM, who cares? You typically only actively use one app at a time in iOS.
If it's in the background and using too much RAM, it can be booted out.
I'm not sure what the problem here is. Especially with a game that doesn't run in the background at all.
There's enough crying about tab reloading on these forums to fill an olympic size swimming pool