I've only got a GP2X F-200, so I can't test. But I confirm that playing at Machinarium on this handled console would be great !
In theory, the game should work. I don't know. Basically, I see two possible issues :
- The Flash Player on the Wiz is probably not the "official" Flash Player, so it doesn't succeed to read all Flash content (especially recent Flash format features).
- The game is made for large resolutions, and the Wiz can't resize the display for its screen.
It can be also a combination of both : the free player on the GP2X isn't able to stretch the game to suit in the console screen.
Have you been on a Wiz forum ? They may have similar problems with others Flash games and have found a solution.