The problem, as attila77 says, is the lack of real hardware. The SDK doesn't emulate Open GL-ES, so you get the full Open GL of the host computer available. This isn't particularly helpful.

There are also outstanding questions, raised on maemo-developers, about whether you have to stop hildon-desktop, go through hildon-desktop (and suffer a speed penalty) or use something else which will play nicely with Clutter.

Nokia have this information (they must have shared it with Rovio - the developers of Bounce Evolution), but it's not been well communicated to the community yet. Hopefully it will be, and we won't have to waste time re-discovering stuff which is already known.