I really liked the overall idea! Using the PC as the main gameplay is a very creative concept, and interacting with the desktop was a lot of fun.
I did run into a couple of issues, though. I couldn't really figure out the card sorting puzzle, so I ended up solving it by trial and error. Also, if I went back to the game at certain points, I got stuck. I noticed the music sometimes overlapped too.
Overall, it's a really creative and enjoyable game. Great job!