Actually you are right. It is more like "restriction". I thought about jams where you have a "theme" (what to draw) and some "restriction" (how to draw, style, size and etc.). Yeah, 1bit is a restriction not a theme... But I think that every jam will be so it won't so good. So my plan is looped.
Themed -> Restricted -> Themed and Restricted -> Themed....
If restriction has to much space for you, just imagine any non 1bit asset and draw it in 1bit. For example I am going to draw a bat. Maybe I will change the decision and will draw something else...