The first few levels of this game are truly great. The split-screen mechanic is elaborated on very well. That being said, some of the mechanics, that get introduced in the latter part of the game might seem interesting at first but heavily lack in execution. Another strange part of this game is that the puzzles, while interesting to solve at first, devolve into trial and error type problems later, especially in the part, that changes the sizes of the characters, where some solutions to problems seem more like abusing weaknesses of the platforming system than actual problem-solving.
I also had the joy of playing this game with a second person. I've heard people say, that the single-player mode can get tedious at times.