Very interesting gameplay. However, without reading the code, I was questioning the condition in which the object is considered found. Sometimes you have to dig some extra space, sometime you don't have to. But the game is pretty much smooth and all. Sound effects indicate the progress is great. It helps a lot to know that the bomb is not timed but triggered by the digging.

Pretty nice! I wonder why it lags when you dig... Could I edit you code to fix it? (you can just press inpect and find it with devtools)