Games similar to Penarium include Super Meat Boy. It's paid, but Alex the Allegator and Barbie Seahorse Adventures are free. In total there are three Platform Games like Penarium for Mac, Windows, Linux, Android and iPhone.
Super Meat Boy is a platform game developed by Team Meat and is the successor to Edmund McMillen's and Jonathan McEntee's flash game, Meat Boy, originally released on the Newgrounds website in October 2008.
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Alex the Allegator is a series of games that I, Johan Peitz, usually use for game coding challenges like Speedhack and Ludumdare.
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Barbie Seahorse Adventures is a Platformer created for Pyweek 4 by The Olde Battleaxe (TOBA), and won the team entry. It is licensed under the GPL. It is written in the Python programming language and uses the Pygame library.
