Cool game, I like the game idea of darkness increasing the difficulty while you collect items from monster drops!
My feedback for the game is that right now the difficulty, especially without any upgrades as people have said already, is a bit too high as it feels like there’s an unstoppable horde that just comes after you that feels tedious to defeat.
Something that I would suggest is improving the pacing, maybe make the enemies easier or less frequent to allow the player to build up their strength to later handle huger hordes of enemies when it becomes night!
Additionally, a health bar would be nice for the enemies because it could promote a strategy of prioritizing lower health enemies to get to upgrades quicker.
In any case, good job on the game!