I appreciate you taking a look at it and giving me the feedback. The game was very simple by design as it was more of a journalism exercise than combat simulator and I'm stoked to hear you have some crunchy combat to slot in to suit your needs!
Tbf my combat system is also a single d6 roll, just a low-high nuanced one with diagetic wounds. Roll low and you do badly, and will likely get hurt. Roll high and you do good, and hurt the other guy. Just track the wounds till it feels like the npc or pc should be dead. Only a step up in complexity.