The style is really interesting… you should add more layers of instruments from an orchestration perspective, and I think it would turn into a truly impactful piece. If I may offer some advice, let the strings section play for most of the time as a full ensemble (using violas, violins I and II, and double basses together). Try assigning the marimba to different parts with other pitched percussion instruments, like the celesta or glockenspiel. I think you should keep working on this piece because it has a lot of potential. Well done!