Hello! I am not currently planning on updating this project for 2.0, maybe some time in the future.
As to your request, I have a similar project for Zelda-Like combat, where you would just need to implement health and attack damage, here.
P.s I did not make GB Studio, it was made by Chris Maltby.
ah no worries, after gruelling afternoon with some help from gab studio Reddit I got everything working ! Cheers