Good and bad
It is good becuse the user gets to click on the part that is confusing him or her for help about that thing. this way the user does not have to go searching for whatever it was that confused him or her through big menus and unfamiliar terms.
unfortunatly, it is not at all clear to the user which parts of the screen are clickable, you should identify the parts of the interface that you provide help for, by, for example, putting a border around them.
also, this is kind of self defeating. in order for a person to use this tutorial, he or she must know enoguh about newgrounds to find it. since this tutorial is aimed at exactly those people who can't even do that, they will not be able to find it.
make the back button easy to find. it took a while before i found the 'ng home' button, and first time users may not know what that is.
if you're going to add a really long opening credits and a boring intro, provide an option to skip them.
make the back/next buttons on the text stand out more, they look like regular text.
it would be nice if newgrounds provided something like this anyways, a contextual help over all their buttons, like a "whats this" in the old windows systems, or a tooltip.
anyways, your heart is in the right place, but there were a few serious user-interface issues and some problems with the target audiance that make this tutorial not very useful.