I love the art and think it fits in really well with the music you have. I think that the concept is also great, but the timing is pretty hard to get right. I also think you can make the "attach" more intuitive to use and more visually appealing to the player. (Obviously, this is something that you probably didn't have time to implement in the Game Jam's time restrictions)
Great entry to the jam and a blast to play around with :)