A very good first
I am impressed because you did not make many of the mistakes that many spriters make, and it is only your first flash. For example, rather than small barely visible words you have large easily readable ones, yourchoice of music was fitting, and You obviously have a good grip on where a stry is, and where you want it to go. For your next flash, try to focus a lot on timing of movement and natural phyical movement such as jumping falling at natural angles and speeds. Let me know when you release your next project.