I love the idea of finding recipes and combining resources to craft items against a powerful boss.
Crafting was very unintuitive though, I don't think I've seen a game where you need to drop the items on the ground in order to craft. I died twice before I found out how it worked. Using the scroll wheel was also very slow, would've preferred another method of choosing the items.
One thing to help the player find their ground would be to only start the boss-arrival timer when the player manages to craft something for the first time.
The vibe and setting is good though. The art is simple, but manages to convey the intended, oppressive mood.