Solid mechanics, but flawed sequencing of these first levels. "In and Out" and "Watch your Step", for example, feel like they should have been the final test for the respective skills they were teaching. It didn't feel right that the end of the demo was considerably easier than the middle of it.
I was also disappointed by the lack of personality in the character designs and environments. I was overly aware that everything I as looking at and interacting with had been placed there by the developer, rather than being an actual part of this game's world.
I do still look forward to the full release, but my expectations have been lowered a bit by this demo.