I'm fairly sure that feature already exists. On Amazon tablets (and phone) it's called Free Time or child profiles. I'm confident there's an Android equivalent.

I'm fairly sure that feature already exists. On Amazon tablets (and phone) it's called Free Time or child profiles. I'm confident there's an Android equivalent. If not, on a rooted Android phone you could just run your own shell script which could periodically check running or installed apps, and close or uninstall undesirables.