Remarkable: SOUND! Nicely utilized, even if the bouncing sound effect *might* become a little annoying after a while.
Needs Improvement: I mostly agree with what has already been said. The ball bounces unpredictably sometimes, especially on the windmill level, for example, leading to situations where I felt like the game was screwing me over. I don't *think* that's how you intended it to feel. On other levels (04, for example), it feels like there isn't really a viable strategy that I can get better at (or maybe I just don't have the patience). Regardless, on that level especially I felt like I just had to get lucky with my bounces to finish it.
Successful: Nice variety of designs, with a couple interesting mechanics, some that you re-use (like the controlling of multiple paddles). You could combine those mechanics in a huge variety of ways to build more levels.