Here is a comment, you should add a place where those hearths would be constant, so cut the game field a little, so the player could see his hearths all the time.
Also the game is supper slow, increase ball and paddle moving speed, or reduce the playable field size.
Try to add special events, a object will freeze for 1 second. So if its paddle cannot move it for 1 second, or ball just stops for 1 second. Try to give it flavor its really plain.
Other then that, there ain't much to it. Almost everybody started on stuff like this
.