Very nice game! Love the way the combat feels and how rewarding it feels to finally get your hands on an item! Love the detail of the different music themes having a battle mode, I rarely see this in game that are made in 4 days like this! I love love myself a good eldritchian type story, this story has the potential to turn into something very very yummy.
This has been mentioned in someone else's comment already but my main issue with this game is how slow it feels to walk around. Especially since we don't have a mini-map and therefore need to explore around to find the correct path. It feels even more harrowing when you have a very poor sense of direction (like me) and cannot figure out if you went down this exact path before or not. In the end I stopped playing around the middle of the second biome, because I found the door but couldn't find my way around to the key and lost patience.
Good job!