Ok, so you THINK you're doing well till you get to Citadel of Shadows and realize this game was NEVER meant for those with A.D.D. or even youngsters in general. It takes mad patience and timing. Vexx has a small lag (not to mention he slides sometimes) when you want him to either stop or start moving and it severely affects timing on platforms and jumps. If you an get used to this you're the Vexxmaster. If not you will spend hours upon hours watching the game over screen and having to start from the beginning of the level.
The game seems well thought out and put into play, but the camera controls are inverted (at least for me) and they can't be changed making it too difficult to play. For an original XBox game, it has decent graphics, and the sounds was well done. I just couldn't get far because I would move the camera forgetting that it was inverted and walk off a cliff, or miss a jump, etc.