I'm not thinking of taking Mine Fu anywhere else, but you never know. I might make a sequel or something, that would most likely be called Super Mine Fu :P But for the moment the game will not change.
Regarding Lives and Scores, these are done using Variables. Variables numerically keep track of anything you want. I simply showed images of the numbers that correspond to the values for Lives and Score.
The item icon is coded just the same way: the default sword icon corresponds to value 0, the shuriken icon to value 1, etc.