I always do one game at a time, I've never worked on multiple projects. However, when I'm doing a commisioned game and find myself waiting for instructions from another party, I have to spend my work hours doing something useful. This is why as soon as I have the instructions, I'm completely going to stop Knyttwadf and work full time on this, and once it's done move back to working full time on Knyttwadf. I try to live off game development now, so there's no time for slacking.