What's the normal phone temperature/ is my phone's temperature too high?

I bought a new phone about 3 days ago (Samsung Galaxy A7) and I couldn't help but check the temperatures. I downloaded cooler master and these are the temps I got.

Idle: 22-25c in a 20c room.(lowest temp: 18c)
After gaming for 2-3 hours: 27-30c
After gaming for 5-6 hours: 29-32
(Highest temp: 32.6c)

I checked my old phone's and tablet's temperature and they idle at around 29-32c but they don't feel nearly as hot as the a7. Is it because the other 2 are made of plastic while a7 is made of metal?
Added (1). I forgot to mention that the games I was playing were pretty heavy. For example; Need for Speed no limits, Clash Of Clans and Dead Trigger 2

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