Thanks for playing! I never felt it was necessary to explain the wall crumbling as it was just directly ripped from the pokemon minigame, but maybe I could add some more juice to the bar to better communicate that fact. (Also, hitting a metal block simply does more damage than normal to the wall, which could also be better communicated.)
I'm not sure enemies are really the style of game I had in mind, but purchasable bombs and starting boosts all sound like really good additions!