What are some alternatives?
When comparing Secret Maryo Chronicles and SuperTux, you can also consider the following products
Hollow Knight - Descend into the Dark Venture down into a beautiful, ruined world of insects and heroes
Super Meat Boy - Let's start with what's the same: Dr. Fetus is still a jerk, gameplay is super challenging but fair, there are tight controls and great levels and you will die. a lot.
Braid - Resource planning & scheduling for professional services
Minilens - Libre puzzle platformer for gravity-oblivious aliens
Cave Story - Cave Story Tribute Site is a tribute fansite to a Japanese game called Doukutsu Monogatari and translated under the title Cave Story.
Limbo - “Dark, disturbing, yet eerily beautiful, Limbo is a world that deserves to be explored.” Joystiq. “Limbo is as close to perfect at what it does as a game can get.” Destructoid. Buy LIMBO: Special Edition.