I don't think the game is too difficult, I'm clearly not the best at those kind of things and I finished it, it was just challenging enough. But the doors bugs, I gets regularly stuck in the door, can't go out and can't moove. In one level (the one with like five falling blocks and two other falling from the sky), the floor under the door got no hitbox in almost all my runs, I was just falling through.
That being said, I realy liked your game :)

Short but surprisingly fun game. I loved playing it. :) 

Took me a minute to find the controls so I could exit the level, but levels are well designed and it's a great setup. Good job!

Very good cute little platformer. I liked the level of challenge it gives. well done!

So fun