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Not sure if this has been brought up yet but the coin multiplier is bugged in Stage 2 Hard.
It should be applying a 1.6x multiplier but only does standard 1x.
With full shop upgrade, Stage 1 gives 30 coins per drop, Stage 1 Hard with a 1.4x gives 42 per drop, but Stage 2 Hard only gives 30.
This seems to be true for all sources - drops, halu, level up bonus. Didn't check chest coins as those themselves have some variation and I'm not even sure if they're affected by the multiplier.