Nice job - I particularly liked the fourth level where you had to think more about which tiles were correct before building on them.
Has all the features of a complete game.
The rotations seemed to be random, I'd like to try playing it with the rotations fixed to 90 degrees clockwise per click as it would make you plan your clicks per tile rather than swear at yourself when you clicked once too often - both methods work though, maybe have both so people can compare the two methods.
cheers