It's not exactly Earthworm Jim as we remember: Nintendo of Europe's info page for the game reveals that, in addition to what looks like a faithful port of the Super NES game, the DSiWare version has " facial-expression-based challenges" that require you to make a particular face at the DSi's camera.
Hopefully every single challenge will require a "simultaneously frustrated and delighted" expression, because that's the face we all make unconsciously while playing Earthworm Jim.
