Smashing everything was very satisfying and I liked the smashing sound effects. This game was nice and simplistic nothing confusing about the game or controls at all.
I liked the idea of the anvil looping from the bottom to the top as a way to implement the theme.
Maybe as an improvement to make the game a little more challenging you could add certain blocks that the player has to avoid smashing so the route you chose down the screen matters a little more, or maybe some that will lose the player some momentum when they hit them so the levels are solved slower (maybe the levels could be timed).
You could make more levels where these challenges matter a little more each time.
Just some suggestions for future improvements :)
Overall a fun and satisfying game.