Awesome, awesome game. I remember playing the demo and couldn't wait for the full game to come out. I wasn't disappointed! Although I'd like to point out that there were a few bugs. Sometimes the first boss, Betel, would freeze up and I could neither fire or touch him and had to restart the game to continue. Not that much of a problem since it was the first boss and the game isn't so long, but it's something to take note of.
Also, for everyone else reading this comment, make sure that after you beat the game you watch the credits to the end! There's a bit of a surprise. =p
@Anris, use the lantern and you'll find that you have to shoot at the eyes.