Please note that I do not know how the indicator will perform on strategy tester. It takes volume into account while doing the calculations. So please use a accurate volume history. Also it is recommended to use a ECN broker for live testing.

LOOKS NOTHING LIKE THE PIC 

PRICE STEADILY DROPPING BUT INDICATOR SHOWS STRONG BLUE COLOR

play around with settings and thickness of lines etc. Its looking like this in my chart. Else message me your settings.

Strong blue colour is because its the total reference volume. If you want to see the buy or sell activity, you need to select it from the inputs

I would had gone short after the rally on decreasing volume. after some more analysis from looking at the buy n sell maps separately.

Some analysis on 4H AUDJPY

When all heatmap cpmponents are strong, it might be best to stay away as it indicates a volatile situation.