Well...
For being ten (or so we are meant to believe) and showing off your Flash skills, you aren't too bad for your age. However, don't use your age as a tool to attract pity. You'll get no such thing, whether you're eight or eighty. Anyway...
For its purpose, the game is stable enough. I didn't encounter any glitches of any kind. You've coded the basic functions well enough; that's where you shine. Your usage of a Link sprite and coin sprite isn't all too uncommon either, so you can at least pat yourself on the back for not failing at the animation structure.
In terms of music... I'm not going to complain about the song itself (but I will mention I'm not exactly a big Lady GaGa fan... Lol...). However, you might want to consider how you use music in your Flash work. Music has a powerful set of tools to use, but just like real life, the wrong music for the wrong situation is like using a pair of needlenose pliers to spread tile grout: it doesn't work. Just consider the themes used in the Flash itself (atmosphere, situational usage, etc.), and be careful with how you use it: it can be decent or a complete disaster depending on how you use it. Just as a side note (take it as you may), Lady GaGa doesn't go over well on Newgrounds.
Just a general tip to go around: take your time. I know you might get impatient, but Rome wasn't built in a day. More time taken to reinforce your artwork and paying attention to detail will make your Flash better overall. Orchestrating, animating, and constructing the aspects of Flash artwork is a reward and a pleasure in itself, so take some time to stop and smell the rosebushes if you will. Then soak in the detail of those rosebushes and apply it to your skill.
You have great potential. I can see it in your work. Keep working at it and pushing forward, and I just know you'll come up with something great. Though people may taunt and belittle you, remember that you can create something incredible with your hands. When that day comes, you'll have the pride to say, "I made that." Good luck on the way. :)