An okay spriting tutorial.
Tutorials are nice to help beginners, but I must tell you that you are breaking apart your sprites incorrectly. By breaking them apart with Ctrl+B, you leave the background attached with the rest of the sprites, requiring extra work to cut the background out. Instead, go into Modify and select Trace Bitmap. Set the Color Threshold to "0", the Colors per Pixel to "1", in the first drop down menu select "Pixels" and in the second select "many Corners". This allows you to just select the background itself and delete without having to specifically cut out each individual piece.
Now, aside from that, it was a good tutorial, though I suggest adding additional music so that you have many options to choose from as well. :D