Strangely enough, the game was recently ported to the gameboy advance(with the approval of Eric Chahi it seems), and the rom can be downloaded legally at
www.foxysofts.com. I played through the entire game using the VisualBoyAdvance gba emulator, and it seems to be the same as I remember it. I haven't played the version that was avaliable here, however, and I can't tell you if it is identical.