Creative concept, and it looked like you put a lot of time into aesthetics, as this game looks put together. The character designs are have been done well, and the animations are smoot.
Some problems with this is that the chain pulling can be quite a tedious process, as it is very slow compared to the player and enemies. Shouldn't the difficulty increase as the player progresses instead of completely depending on the chain? How come only your own bullets move the chain and not the enemy bullets?
For now it just seems like an arcade where the only goal is to get as high a score as possible (I believe that is why you chose the screen to be shaped like that). Unless you want it to stay like that, it would be cool to see a level system. I suggest an option to choose at the start to play in either level mode or an infinite arcade mode.
Overall, it has great potential and I hope you will continue to work on this.