Thank you for your coment, i was thinking about using enemies like that but it would take me more time to do that and i didnt had that much time unfortunately. And bcs of the same thing i didnt add more new mechanics but i tired to make levels progressively harder and harder but idk. And its kinda funny but for me these jumps didnt really seemed like really pixel-perfect idk, anyway thank you for your view of my game. :)
I remember that there were mainly two pixel-perfect jumps. One of them was at the very beginning (jump number 7 counting from the start). In the third level, this jump changed into a moving platform, which I found easier. It is possible that the problem was that this jump was impossible to perform if you did not have a good running start.