Fitbin

Fitbin was created in 7 days for the #speccyjam game jam in 2014. A simple platformer, it was created in Game Maker, it uses ZX Spectrum colours and resolution and runs at 15fps.

Speccyjam was a game jam in which developers created games with the look and feel of the ZX Spectrum, the classic 8-bit home computer from the 1980s, over one week for any platform. The games need to use only ZX Spectrum colours and resolution, and can optionally use the "attribute clash" rules to make them look more authentic. However, you could use any game development tools and target any platform (browser, mobile, PC, etc.); it doesn't need to run on an actual Spectrum.

Music by Bill Wood.
Everything else by Glen McNamee

Bugs:

Music doesn't work in the browser version.