You made everything by yourself? Wow, that's an effort. But it was worth it. The audio was really really good (Sound effect were well placed and the music fits the ambience). The Graphics, from background to character looked all awesome. Only the level design/mechanics were a bit strange. The character can only hammer to the left and right or am I wrong? I would change that to give the player a more versatile experience. But overall it's a awesome game for a gamejam!