Zoandroid
Android Expert
Actually Zoandroid that was a different guy. My phone never got hot playing games(I use past tense since I don't have them installed anymore).
Oops. I am sorry for the mistake. I was typing that reply on my newly acquired Droid X, experimenting with Swype. I guess I missed that it wasn't actually from you.
Back to my previous suggestion, then. If you can figure out whether it is the Ally or the battery which is actually the cause, then you will know what options you have to deal with it. If we lived near each other we could try trading batteries and experiment. Know anyone personally who also has an Ally?