Short Stories with Tragic Endings

I am in some high-contrast green field, fighting a very Kingdom-Hearts-like suit
of armor. I win but just barely. I man shows up and gives me a catalog of power-ups
and techniques. I look through and there are many dealing with that suit of armor.
One in particular had something to do with making them disappear in a bunch of
yellow stars and getting points or something. I think, "What a useless power-up",
then wake up.