Plee the Bear is described as 'fun platform jump and run game, in which you're a bear, trying to catch his son, which ran away after he ate all your honey'. There are three games similar to Plee the Bear for Linux, Python, Windows and Mac. The best alternative is Ardentryst, which is both free and Open Source. Other Plee the Bear like games are Go Ollie (Free, Open Source) and Abe's Amazing Adventure (Free, Open Source).
Ardentryst is an action/RPG sidescroller, focused not just on fighting, but on story, and character development. Strategy as well as reflexes will be needed to overcome the game. The game is set in another world.
Go Ollie is a free Linux game with beautifully rendered scenes and animations The latest in innovative mouse controlled platform gaming featuring a unique fusion of platform and match three gaming mechanics Two gameplay modes: Story Mode with over 60 individual levels each with...
"A scrolling, platform-jumping, key-collecting, ancient pyramid exploring game, vaguely in the style of similar games for the Commodore+4. The game is intended to show young people (I'm writing it for my son's birthday) all the cool games they missed."