There are some really cool ideas in here. I particuarly liked the construction menu with the different materials and the interaction for applying those materials to different parts of the building - that was really ambitious and cool! I did struggle with the table-top orientation of the leap... I'm not sure if it was just my setup or not, but I consistently had a hard time holding my arms out far enough to interact with all of the bubbles and buttons I needed to poke. It would have been really cool to use this with the Leap attached to the HMD so I could look around without worrying about losing tracking. The robot guide was neat, and I liked how the tutorial was displayed in animated text as well as spoken. The "snap" to the neutral pointer finger gesture was clever too. Overall nicely done.