not really kaizo since the average platformer player can beat it, but it IS harder than the average platformer (let alone the average generic platformer). you will either give up, break your computer, beat it after 1000 fails or beat it after like 5 fails or something you will sometimes have to get paininated to get enough height for a jump.
playtesting this game was pretty easy since i was making levels while in them and then just had to check if it was possible also half the things in the original game look like blender forum posts when you select them because they use so many shapes when you could do it in like 2 and it would look better (for example: the ground in EVERY LEVEL (except for the penultimate level because it has no ground) uses several shapes when you could do it with a gradient rectangle and a green rectangle and it would not only be easier to align but it would also look better) (no offense) you could probably do this without paininations if you jump next to the start of the next level