Pretty fun.
It's fun. There're a bunch of small problems and some missed potential though, and it all adds up very quickly.
First thing that me was that you didn't animate the main character's legs as he walks. What the hell?
I feel the enemies have far too much health: a single whack from the Sword should be enough to down one of the basic soldiers. I think it'd be good as well if you could charge up the fist to deal more damage. The ghosts were really annoying, but they could be made tolerable by reducing their health (namely, so that they die in a single hit).
Now, either the cost of the weapons should be reduced, or something should be done to make the game more interesting, like having the scenery change. Of course, the scenery should change regardless, but it takes so long to work up the money to buy the more powerful weapons that the game gets very monotonous. Changing scenery would help with that.
Other than all that, the game is fun but nothing special. Nothing particularly original, it sits on a gray area, not quite absurd enough to be considered funny or comical, but obviously trying to be. Of course, you made this in three days, so yeah.