Now that you've started writing some code, you can start talking to users!
Here's some quick feedback I've got:
-It's a little hard to tell where on the screen I can touch to move the miner vs. where I can shoot. Perhaps but a line on the bottom demarcating where touches will move instead of shoot?
-Perhaps the game would be more fun if the movement was faster? If you sped it up, it would make it easier to grab 2 pieces of cheese on the same row. It's up to you to decide how to balance control responsiveness vs. difficulty, but it's worth testing it out.
At any rate, good job and congratulations!