Jacquie Lawson does these marvellous E-cards which were a pleasant discovery when I was first sent one. Crossing that with a computer game seemed worth trying.
Virginia and I sometimes create paper chases round the house on birthdays and the like. Children know how to have fun where adults have forgotten. Doing something similar but on the computer appealed to me.
I'm also trying to learn from my previous attempts at game-making by making something more accessible. The short time to produce the finished game will focus the mind wonderfully.