I remember playing this when I was a lad. I could never finish it with my kid fingers, so I redownloaded it for a PS1 emulator and finally beat it about two years ago. Unfortunately, I got the worst possible ending. So here I am, back again, playing this game for the third time in my life, and hopefully I'll get the good ending. Wish me luck!
Oh, and nostalgia aside, this is a great platformer, requiring a lot of thought, timing, patience and the ability to refrain from punching a hole in your PC screen. All round great game, a solid 10/10 from me.
A good thing to note is that you will absolutely need your sound on to communicate with the other Mudokons, a detail, but relatively important none the less.
EDIT: There's an HD remake of this game called New 'n Tasty and it looks even better than the original. They are replacing the screen by screen gameplay with a more modern scrolling style. Check it out before buying this just in case you prefer it. I bought both.