right here is my game
i have been able to get the arms rotate to the mouse location but i am finding it difficult to get a working shooting mechanic that can also shoot towards the mouse
not sure m8
this would help me if i was doing a 3d side scroller but i am creating a paper 2d side scroller 
Hey!
I was having the same problem to my side scroller game, until I found this tutorial:
It is perfect! Hope it helps you, Good Luck!Hmm, and isn´t possible to adapt it? Sorry if not helping you. Good luck!
i am going to look into adapting it. thanks for the assistance