So basically this is a completely different game that just happens to illegally rip JJ2's graphics?

Let's get the facts straight, this is made in game maker, and it doesn't support any of JJ2's native formats. Thus the myriads of user-created contents don't work with it, much less the original tilesets which I doubt you'll be able to replace by something equally awesome. And, judging by the screenshots, the content you didn't rip looks horrible. What advantages does this have over the original?

If you want to do this as programming practice or something, sure, go ahead, and I can always appreciate it if someone want to make new content for JJ2. But you might want to ask yourself why anyone would want this when it's done.