Incredible work. Havent gotten past mine 2 yet but i noticed on mine 1 after some time bombs stop appearing. If you rset they come again. But i bought more coins three times and no bombs appeared and then i reset. But you did and incredible job putting this together. Its brilliant.
Viewing post in Gem Mountains jam comments
The types of explosives are linked to the size of the matches, starting with dynamite on a match 5, bomb 6, of type match dynamite on 7 and above. So if the play area gets clogged with Stones, then it's hard to match. My strategy tip is to use the Reset button to clear out the grid, and start a fresh, get some new explosives form easier matches, then blow up more stones! :).
Hope that helps you on the way to the Danger Mine! :D