What are some alternatives?
Secret Maryo Chronicles - Secret Maryo Chronicles is an Open Source two-dimensional platform game and is using an Open Graphics Library for the best possible graphic design and stock performance.
SuperTux - SuperTux is a classic 2D jump'n run sidescroller game in a style similar to the original Super...
Chasm - Chasm is a randomly generated Platform, Action-Adventure and Side-scroll video game developed and published by Discord Games.
Super Mario Run - The mobile Mario game you can play with one hand!
BlackMagic - Black Magic is a Single-player Action-Adventure video game released by Datasoft.
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.