I've managed to port Numpty Physics to WindowsMobile devices. It works fine with Asus MyPal A696 and the emulator. Only QVGA version.
"return" button should undo the last stroke, some of the application buttons should pause the game, rest of them should exit the game. You can move to the next level with left/right. Some additional levels can be found on the internet.
The Numpty Physics2 file should is working on HTC Touch Diamond which has Qualcomm chipset, maybe it'll work for you guys with "Not a valid pocket PC application"