So, I did not know there already was a game like this called ATOMAS. And I don't know if that game has the added mechanics that you mentioned in the comment below (Which sound great).
Regardless...
The look and feel and music of this game you made are really good quality. (From the atomas screenshots I have seen, I like yours much more!
Glad to hear that you are working on an expanded version. I will save this game for when you have made the expansion.
Great job!