Excellent game! Ultra addictive! I've been playing for about 2 hours.
Great pixelart graphics and lovely sfx and music too!
The only bugs I found are:
1) when you die, and try a new game, sometimes the night don't trigger the demons, and the villagers keep spawning like during the day. But nothing that stops me from refreshing the page and trying again
2) the altar 20% upgrade doesn't seems to affect at all. At least doesn't regenerate nor make it more resistant to enemy hits.
Overall the game is really really fun to play and replay and replay again.
Congratulations!