I must say the controls/physics/movement etc of this game are exceptional. Sometimes the ball bounces obliquely but it is never a hinderance. I have't lost a life yet.
It's an odd choice to have it be a specific block to hit rather than clearing all blocks. Plus, there are levels with 2 shiny blocks. This - coupled with no enemies or hazards - make it a little to easy. Very enjoyable nonetheless.
EDIT: I finished the game. I lost one life. Level 9 was tough because it felt mostly dependant on luck to hit the shiny block. Kinda wished it had one more level to round out the numbers but that's just me.