*SPOILERS*
Nice little ARG experience!
I enjoyed the puzzles and felt a huge sense of accomplishment when beating the 2nd one. I'd argue, though, that games that require changing some computer setting are not a good idea unless there's some obvious indicator or other stages do the same; this is specially true after the 1st level, where you simply use the mouse to drag something; the 2nd stage makes you believe that you have to drag the sun to the sky.
The morse puzzles were enjoyable, and the message at the end took a while but was sweet.