This is one of the most stupid yet addicting games I ever played! :)
At first, when I realized what was the gameplay I thought: "Seriously??"
but then with the upgrades and achievements everything became more interesting. And even if I was still thinking that this was not making any sense nor being challenging or exiting, I found myself continuing playing just to see what will happen next and if there was an end of it.
I won't tell it guys. play and figure it out. :P
p.s. you definitely have to add some challenging to it. You could add a time limit and then a score leaderboard with the best results in that time limit. Then don't guide the player through the upgrading showing only 3 or 4 of them at a time. Display a lot of them and let everyone choose an upgrading strategy. ;)