We still need more BALLS! Perhaps to lower the "stress on the physics engine", how about you cut/shorten each zone like only 10 rows of diamonds instead of 16? So each ball spends less time on the stage and we can get more BALLS :)
We need more BALLS. Max cooldown of all balls should be like "10". Also the effect of the zones like "shrinking zone diamonds" stops after some upgrades, only the modifier goes up
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diamonds can only shrink so far! and ball spawn is lower to reduce stress on the physics engine, thanks for the feedback though :)