Great game! Spoiler Warning: The bird liking music should've been hinted at somewhere, I only got him to show up with the flower by sheer luck/frustration by trying out everything I already tried 3 times after freeing him.
For some reason all that blurry light that the particles emit makes the game lag horrible for me, to the point where particles just fly right through warps.
XLNT, I dcon't know if you noticed, but K10 isn't just Katzen in German, but also Kitten in English.
Can't wait for what I assume will be a sequel with the kitty as the character.
I finished level 17 with three left over pipe pieces. Not sure if that was intended.
Here is how I did it:
http://dl.dropbox.com/u/9054912/liquidmeasure2.PNG