Thank you very much for this great feedback! I really appreciate the fact that you enjoyed the gameplay experience!
About the delayed jump: "but maybe it's an element that contributes to game's difficulty", indeed, it was intentionally placed, but, as K-Crow Studios pointed, this could difficult too much in certain parts of the game, I really don't know if I should keep it or not, what do you think?
About the grass lump question: It respawns on its original position everytime it is outside the camera view, unless its resting on top of a switch platform.
You enjoying the game absolutely makes my day, thank you very much for the feedback!