You aren't the first to dislike the 4th level, which is understandable. It was the last level in the game so it was a bit of a rush to finish it. The concept was to use the water to do walljumps and to use the water spring momentum mechanic to get past the lava, but I never even introduced that mechanic, leading to confusion and a luck based level. Also, the first part doesn't have anything stopping the player from walking before you've analyzed the level to know what to do. This can probably be frustrating, so I understand why you might dislike this level. However, I'm glad you enjoyed the rest of the game and thanks for the great feedback!