Hi Bastian.
I made a gameplay video of your game (video below).
I think I found a bug. After falling from a platform, I got stuck and was not able to continue the game (look in the end of the video).
Hi Bastian, I did have dad at the first level in the beginning, the first time I played. But I didn't know I had to kill all snails, and so I arrived in the end and was unable to go to next level, nor go back to kill remaining snails. So I restarted the level and the recording video, and dad didn't appeared again.