It depends on what vulnerabilities we’re talking about. If these are arbitrary code execution ones, they may be more dangerous in games since that’s not a kind of app most security researchers will look into. But if we’re talking about in-app ones that let the hacker steal your game stats or something (so only the app’s data), it’s definitely not anywhere near as bad as a browser vulnerability because browsers save much more sensitive data. Also a game isn’t something a bad actor would consider the best attack surface but if they do, it might cause a lot of harm.