Activision put out an Earthworm Jim 1 enhanced Win95 port of the Sega Mega Drive CD version (I still have it somewhere). It'd be great if GOG.com released that, in addition to Interplay's DOS version of EWJ2.
From wikipedia:-
A special edition of the game was released for the Sega Mega-CD which features a Red Book audio soundtrack, improved graphics and expanded levels [1], and an even further enhanced version with redrawn, 256 colour graphics and an Earthworm Jim desktop theme, as well as all the Mega-CD improvements, was released for Microsoft Windows 95.