Phone gets very hot with simple 2D game

Unity Engine
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1

I’ve created empty 2D project, added png image as background, then deployed it to my phone (Lumia 925, WP8 ). To my surprise in several seconds phone gets very hot, as if i’m running CPU/GPU to their very limit. I’ve tried running different games from app store, and never could see such effect.
Any idea, what is the reason of such heating?

I’m will be thankful for any help

2

You’re probably running it in debug mode. That would be maxing the CPU out.

3

Thanks a lot, Tautvydas Zilys, looks like you’re right :-)))