Contract killer wants to "upgrade" my iPad

I downloaded this game, and when I started it, got a message that it " might slow down my iPad" and the developer wanted to "upgrade" my iPad. The message had just an "ok", no opportunity to deny the so-called "upgrade". I couldnt get rid of the message, and had to reset my iPad. I would not advise anyone to download this game.

pinballwizard100 about Contract Killer, v1.5.2