Yeah I know it can be pretty exciting to start on a new idea, but there is a problem and I myself am guilty of this all to much. The problem deals with the mentality that "the grass is greener on the other side of the fence" I'll tell you something that the grass is always greener till you get there, maybe if you would water the grass in where your at? maybe give it some love and care and for this reason I would encourage you to only have one WIP game at a time.

"Conditions are never perfect. ‘Someday’ is a disease that will take your dreams to the grave with you. If it’s important to you and you want to do it ‘eventually’, just do it and correct course along the way."

~ Tim Ferriss