What are some alternatives?
When comparing SpeedRunners and The Impossible Game, you can also consider the following products
Bit.Trip Runner - BIT.TRIP RUNNER is the fastest, most exhilarating music/rhythm-platformer to hit Steam!
Super Mario Run - The mobile Mario game you can play with one hand!
Canabalt - The classic, side-scrolling, retro-themed endless runner game.
Super Hexagon - Super Hexagon is a minimal action game by Terry Cavanagh, with music by Chipzel.
Chameleon Run - Chameleon Run is a fast and challenging endless runner with a colorful twist.
Voxel Rush - Superfast, minimalistic and extreme 3D racing game! Now with real-time multiplayer!