That was quite tough. Puzzles were challenging but the real challenge was fighting with mechanics.
Characters would not jump sometimes. One of the character would also fall off randomly while controlling the other character.
I also got stuck in certain areas, one of them being stuck in a small opening between 2 platforms and the other in which the spring got stuck on the head preventing me from jumping or moving properly.
Another thing I noticed is when you restart from menu, the music just goes away in certain levels.
That being said, The level design and puzzles were really good. The artsyle was gorgeous and the music was nice. The music changes depending on which character you're playing on, which I thought was a really nice touch.