Use the screenify sprite to write your game. Broadcast "jeb" to toggle a text colour changing effect. You can also change the variable "jeb" to do the same thing. Use the colour-named broadcasts to change text colour, or change the variable "colour." Don't change variables prefixed with X/Y/Z, because they are (scroll for more) used for functions. Also, it should go without saying that you need turbo mode. Without it, this thing runs slow as molasses.
Credit to PICO-8 for inspiration, and Nintendo for the Super Mario Bros. font that inspired my own. Credit to Microsoft for establishing the 16:9 standard that inspired the aspect ratio of the project. If even one person cares enough to ask for it, I'll release another version of this engine (I've already developed some new mechanics to add).