Took a bit of time looking for java games that works with touch screen only SmartPhones (no keypads).  Here’s a couple that I keep on my daxian x999+.

Abracadaball
Chessmaster
Megacity Empire New York
Might and Magic II
Millionaire 4th Edition
Petz
Rayman Raving Rabbids TV Party
SimCity Metropolis

You may need the latest version of Java on your windows mobile to make sure all these games run with no issues. I currently have Esmertec Jbed version 20080428.2.1. Hope this helps ^_^