Hey, wanted to give some more feedback - read the other comment and I don't fully agree with it...it's not a nightmare at all, I just think the movement needs a little fine-tuning.
I think the main issue for me is that the gravity seems really high, so the characters drop really fast. They also move a little too fast in general, making it difficult to get the characters on the platforms.
I think if you turn the speed and gravity down, you'll give players the ability to correct things while they're moving, making the game a little more accessible.
Hope this helps :)
EDIT: And for what it's worth, I absolutely love the look of the game. The pixel art is super clean and it's pleasant to look at