if this game was a real-world system I was tuning at work, I'd have already instrumented it with metrics, dashboards, alerts, forecasts and the like; why not do it for this as well? much easier to make Number Go Up if you can see its trajectory charted out.
when you can SEE the journey of a number over time, you can harness your physical intuitions for it; after all, Number Go Up & To The Right sure looks like projectile motion, don't it
the more Numbers you add the more subconscious insights you can generate