Cool start, I can see this developing into a very good game. The collision detection on these games is always the key, I'd take a look at some of the successful GB entries like Alleyway to see how to maybe do better collision. I do like the forgiving nature of the thick paddle though, helps on a less accurate system like GB. Without slightly better physics clearing the last few blocks on a level is very tedious and difficult. Otherwise really good start, I hope to see you continue to work on this