The game is tremendously clever, and uses its mechanics well! I had a real moment of "ah, they got me good" moment when I was trying to build a hammer and got a ham before I was done.
I would really focus on making the controls be more responsive though. Each movement feels like it takes one too many clicks, as turning a corner is two clicks. I get that it's for re-orienting the pointer, but it also lead to the game being slightly painful to control.
Oh, and props on the music! It was very calming and looped quite nicely.