I don't know if they could run on an Eris or not, but any game by Kairosoft is a good bet. Grand Prix Story and Game Developer Story are both excellent games if you like simple micromanagement games. They have a 3rd game called Hot Springs Story, but I haven't tried it yet, so I can't recommend it.
They have demo versions of all their games. HSS and GDS will run you $2.50, and GPS is $5. It may seem kind of pricey, but you may become a believer after trying the demos. I bought both GDS and GPS and this is coming from someone who's only other full-version app purchase in the past was a call blocker for an old BlackBerry.
Oh, and Netflix is good too.