Thanks a lot for all the feedback!
pelle: Yes, Rodland was cuter and had some catchy music.It also rember it as very easy. And no, there aren't really any changes later in the game - just more balls.
I started out by adding one new ball for every level, but then the higher levels became extremely hard to complete.
Zeroone: Yes, I finally found the forum link on the about-page. I've been playing the Java 4k-games for years, so I didn't really focus on the about-page (since I already knew what Java 4k was all about). But I totally missed this forum.