I understand you need some program written in Marie assembly language.
I was able to run your attached assembler, open, assemble and run example 4_1. It is calculating sum of numbers 10,15,20,25,30. I verified memory cell 114 indeed gets set to 64 hex = 100 dec.
I had some experience with 8080/85 assembler on actual control hardware, that helps.
So what is exact problem you need to solve ?
Maybe you need help with making changes to simulator itself in Java? Can help with that as well, just need info on scope of work.