Thanks for feedback. I understand your point, the game is too hard but I wanted it so that the player has to think before spending coins. As you said, you ran out of arrows. In the game, you have to do all the upgrades after you have enough arrows for the night survival.
For a hint, first night, you will require 20-22 arrows, second night, 30-33 arrows are enough, for third night, you should have atleast 40 arrows, and the number keeps increasing.
As you mentioned that the monster don't give enough coins. Actually, this game is about survival more than escape, because if you will be able to survive untill 3rd or 4th night, you will have enough coins to buy key. I think that coins of the goblin enemy are little less as it gives only 20 coins but others are fine. because the black shadow enemy gives 0 coins and the fire ball gives 100 coins. And that is enough to buy escape key for 500 coins.
Although I will tweak the difficulty after the jam so people can enjoy it more.
Thanks For Playing :)