Nice but...
You don´t really what you are doing. I had fun for a while but then I was just pushing buttons. What does it mean when I upgrade attack opposed to speed? The difference shows nowhere, I don´t even know it is there.
A games inputs have to respond to me and give me feedback.
I mean what is the difference between health and defense? How much life do I have exactly, if I upgrade attack will I need 2 fewer slices to kill a skeleton? Flesh out this part a bit more.