Probably very few if any. You should at least get your iPod touch to iOS 3.1.3, the final version a first-gen iPod touch can run if that's what you have. Then there will be at least a few games you can still run. For upgrading to iOS 3.1.3, see:
This site contains user submitted content, comments and opinions and is for informational purposes only.
Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site.