I would agree with my other brothers, you could have made a good plan for it come back, I have not made any great games like yours I know it's a great and hard work in making them, but all can be successful with planning,
My advice plan was you could have made it a 1-5 dollar for one to two weeks and then make it free for a current times, to make your own success it all depends on your planning takes a look at such great games on how their selling plans is displayed