This is awesome. The sound and music is great. The graphics are very charming. The music and graphics together are very retro. The villager SFX are funny (I love the "oh crap"). It's also hard as hell, but feels fair.
My only real complaint is that I don't think the mouse-aim works very well for a melee attack. I think it would be easier to just attack in the direction you are moving. But it was usable.
I don't know if you did this already, but it would be very cool if killing villagers restored health or something, to give you a way to struggle to stay alive in the daytime.
Overall, really fantastic game. Your theme interpretation actually reminds me a lot of my own game, funnily enough.