Metal Corps also looks a fun free game this morning. "Just run around and defend your city with your plasma rifle from the Mech invasion, this game is actually over development, this is a level preview for tech capabilities.
Some of the artwork used in this game is copyright of Konami.
Controls:
HardKey1: Move Left
HardKey2: Move Right
HardKey3: Fire plasma rifle
HardKey4: Jump
Note: In PalmOs5 before any button works, you have to move the 5ways pad in any direction."