Here are my thoughts - hopefully you find some valid points
IQ is a little bit misleading - very simple and basic math quiz - like 6-8=? - so not much of IQ stuff in there.
Would like to see difficult equations on "hard" mode (with more time) and not only a shorter timer.
Also "Easy" gets very fast very not "Easy"
Question: why do you need so many permissions for this game?
And kind of a bug on MY device - after a fullscreen commercial (that are shown way too often) I couldn't close it (was partly under my top menu).
Edit: very nice and neat design - really good choice