THANKFULLY, the manga isn't over. If it was it would be the most disappointing ending one could have hoped for this manga. It's even more interesting the fact that we can't predict what follows. Shimon family also came outa nowhere so why not sth entirely new. And apparently this whole arc was to introduce the concept of aliens(no comment). Apparently this will play some role in the future.
After reading this chapter I realized that in this manga there is no bad guys, I mean in all shounen mangas there's always bad guys, who kill just for fun or like to fight everyone who's in their way. I'm starting to get really disappointed.