I can never forget about this game, the first game I had on my game boy. I wasn't realized as a child these days but the variety of different mechanics was so good. Also the ost was really nice.
I can say that this was one of the key games that made me love platformers.
p.s: I hope this is the correct page for the game i am referring to lul, the game : youtube.com/watch?v=jNGap0Mfh48