Just played the UDK game, Whizzle.
The controls work well and the graphics are nice, although they do not look nearly as good in motion as in the screenshots.
The game consists of one level, where the goal is to break open five cages. The cages are all in sight and the level is extremely small, the whole thing could probably be completed in 3 minutes.
In conclusion, I'm sorry to say it, but this is a complete waste of time. I'm really surprised this game is featured on the UDK showcase. I understand it may just be a proof of concept, but it's still not worth the time in my opinion.