If I understand what you're talking about with "scrolling shooter" then I think a project called "TAC-B" in the project listing is a great example. Sort the projects so the "Staff rating" (number of stars) goes from highest to lowest, and show 10 projects per page. If you do that you'll see TAC-B on the first page right in the middle.
However, it sounds like you're interested in trying out the challenge with SGDK2. It's hard for me to say how easy it would be to do such a thing with SGDK2 because it's so new and nobody has tried much with it yet. It's still being tested. You're welcome to try blazing a new trail here. If you come up with something interesting, maybe you can share it and get it into the SGDK2 library so other people can make scrolling shooters more easily.