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"Needs a way to disable newly added sounds"

There will come a settings screen in the future where you can turn sounds off - until then please use your volume control of the phone to turn off sounds

"Also, need to fix the fact that the diamond can be placed in unreachable places (surrounded by rock)"

That's hard to do because the whole level can change over time, so it is not possible to generate a level where the diamond is never surrounded by rocks.
But you can simply use dynamite to reach the diamond (it can not be blown up) - if a stone falls onto the diamond, you can DIG this field! (that's more a workaround .. :-) )

"Auto saving doesn't seem to happen"

The game tries to autosave whenever it is possible without disturbing the player (exiting game or switching to another app)
In later level autosaving can take several seconds, so if the game would autosave to often, the player would get annoyed

Sorry, that I cannot contact you directly because it's not possible in android market to react on comments.