Don’t want to spoil your fun, but XNA is pretty awful. It’s pretty bloated and lacks power, and no serious developer for 360 works with it. If you want to get a job some day making games then you really need to learn the real SDK, or else just learn C++ and you can go from there.
Now if you are just messing with it for fun, don’t worry about it.
Erm… for everything Aquaria did right, the animation was god awful and the worst part about the game. Flash animation can be done decently, but definitely not in the style that Aquaria used it. Flash animation is also never, ever, a substitute for real animation.
Bingo. If you have any interest in game development at all, don’t mess with bullshit like Game Maker programs or whatever. Learn C++, learn DirectX, and make a basic game with them.
Fact of the matter is, people with little or no programming experience (high school or 200 level college classes are not experience) have no idea how much depth there is to it. Trying to put together something simple and functional as a game is the first step towards being able to make something decent.
The good news is that Microsoft has a free version of Visual C++ you can download here:
http://www.microsoft.com/express/vc/Default.aspx
And the DirectX SDK is also free to download:
http://www.microsoft.com/downloads/details.aspx?FamilyId=4B78A58A-E672-4B83-A28E-72B5E93BD60A&displaylang=en