If you haven't checked out any of Nifflas' games, I highly recommend them — they're characterized by simple gameplay, sprawling nonlinear worlds, cute creatures and neat ambient music and sound (which he often designs himself, to boot). You'll have to hit the forums for Knytt Nano, but the other titles are available for free download from Nifflas' site. [Thanks Anonymous, who tipped me off via Sexy Videogameland!]