seiklus is a freeware exploration/adventure game that I made in 2003.  (v1.7), about 2.6 MB

You can find seiklus for Mac OS X here, thanks to Leon Arnott.

Here are some other things:

seiklus FAQ  updated 2012.08.25.
seiklus design sketches  updated 2012.11.18.
seiklus fan art  updated 2012.09.16.
seiklus interviews  in various places.

Here are a few scenes from the game: