I won! This is such a great puzzle game, I'd have happily played more levels. The art is so wonderful, with the characters fitting into different block shapes with such style. And the little stories about the employees are great. I especially liked the two symmetric coffee drinkers.
Level 5 was the hard one for me. I like Dwayne though, because he adds the most difficult constraint, which gives you a starting point to work with. Once Elizabeth becomes friends with him it's easier because the solution space is more obviously constrained.
I had some difficulties finding room to rotate and manipulate the pieces, and occasionally a piece would bounce back and settle into a 45-degree position and I'd have to refresh the page. But thanks to the level navigation it wasn't frustrating and I could go right back to the level I was working on.