This is a quite a complete adventure game with lot of well implemented mechanics. The crossbow animation is quite satisfying and I liked the different objects.
An improvement that wouldn't be too costly to implement and that would really increase the appeal of the game would be to improve the background (just a darker one could do) and find a good animated model for the character. These are two elements that are constantly on screen so improving them would have a lot of impact on the appearance of the game.
That said, for a game made by just one person in only a month, it's great, you can be proud of yourself!