Not bad! My favorite thing was all the goofy names for the enemies, haha.
In terms of complaints, I am just going to repeat things that everyone else said: it was a little slow, there was not much variety and depth in the combat system, and there should probably be scaling costs on the upgrades. The way it is now, if the game were longer, I am just going to max stat it to death since I can pump one stat for the same price and deactivate my brain. :D