Lariad: a space adventure

Lariad is an free exploration based action/adventure game for Windows, Linux, and Mac OS X. The protagonist is a swamp dweller who lives peacefully on his wetland planet, all by himself.

Then, one fateful night, unbeknownst to the swamp dweller, an intruder lands on his planet and steals something that's very precious to him. Swamp dwellers are not the kind of people one should mess with though! Things must return to the way they were, and you must help him do it!