Help with phone heating. Twice less cpu and gpu usage, still twice more heating.

Hello!

So I am making this arpg for mobile and I wanted to pump up my graphics a bit and add more enemies to my game. Problem is that the system seems to heat a lot now.

For reference I grabbed modern nice graphics MMO from play store called Dawn of Isles.

This game reports around 30-35% CPU usage and 45%~ GPU usage but the temperature stays at 40'C

My game reports around 15-25% of CPU and 30%~ GPU but the temperature is steadily growing, and switching back to Dawn of Isles makes my Phone to cool down.

So please if someone has any good insight if there is something more to the heating of phone than the usage of CPU and GPU, I would really like to hear about it :S