It seems like a nice update! Although I will say, the mine bombs will still be useless. It just ruins the mine and after using the bombs it will make it harder to mine stuff, It is better if you make a trader that traders x bombs to a multiplier or an auto sell.
Why it's still useless:
The mines will be destroyed after using it and it will only make it harder too mine
That's not worth the 1x multiplier
makes it harder to get the mine to reset
For example:
10 Nova bombs = 1.2 multiplier for X time.