[ikeboy]

Tiki towers was also good. I haven't played enough recently to have too many more, but I would recommend Cause of Death (not on app store anymore, can download from hipstore and copy episodes over on a jailbroken device), as a text based game that was really well thought out.

Of course, you could always get a Gameboy emulator (even not jailbroken, Google it) and play whatever you want from there.

I also recommend the port of Bike Or Die, which was all the rage in the Palm era when I was growing up. Ios version is OK, although I'm not sure if it's still on the app store. You can probably find an IPA though.