I updated my iPod touch to ios5 and some of the games failed to load, most of them are 3d ones.

Well, I actually don't like the some of the new features so I want to recover iPod, would that be possible?

Downgrading theiOS is not supported by Apple.
Have you looked to see if there are any updates for the games?  Many develpers have had to update the games foriOS 5.
Also try:
iOS: Troubleshooting applications purchased from the App Store

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