@Preece
You're feedback is most welcome, and I'm glad you have enjoyed it. You have pointed to two things, which I was also thinking about. I was hesitating that instead of an introduction screen, maybe I should include some simple levels each with a new hazard or obstacle. I've also asked the question, if there should be multiple solutions for a level or not. With more open options, there's always a chance, that the player might just press the buttons until they find just happen to solve the puzzle. I'm still thinking which approach should I take in the two cases mentioned above. I'm happy that you have pointed them out, and have gave me some direction. I don't want to write a blog here, but basically this was the reason why I started this game in the first place. It has a pretty basic core on the surface, but it gives me a good opportunity to study and experiment with level design, player teaching, difficulty balance and so on.