Okay, the engine is still very much in development, as is Anteworld. I see no need for sound when you make a crater, because the only point of that feature is to show that terrain deformation is currently being worked on. Game modes and such are a LONG way out, as far as I can tell. Unfortunately, if you are finding that Anteworld isn't very fun right now, you could always come back in a few months and see what progress has been made.