Earthworm Jim was one of the first legitimate games I ever played. As A child, I savored the game's lush animations and farcical creations, deeply enjoying the action it had to offer. This game is amazing for all reasons, stellar design, curvaceous difficulty, and a chaotic story that Douglas Adams himself could appreciate. Doug TenNapel's finest work, but there is a drawback to this particular iteration.
Unlike the CD -ROM version, the DOS game plays rather clunkily, with some revamped physics which made the game considerably more challenging (In a bad way) and so-bad-it's-terrible intro art. However, the same amazing game is still at it's core. Ultimately, I would suggest downloading, in the hope that the fine folks at GOG manage to upload the CD version with extra levels Big Bruty and More Junk. Also, the numerous extras help sweeten the deal to a great extent. Just Go For It!