My idea: a clicker game for C64, where you are a coder in the 80s who has to write BASIC code. As you proceed you get sleepy and therefore write less code, but include more bugs. You have to rest and eat to gain energy, but you lose precious coding time. You also have to watch memory, because these 38,911 basic bytes are gone faster than you can say: "I wish I had an Amiga 500!"

Basic (BASIC, haha!) functionality is done. Not sure about some game elements yet. Eg. where to get money from to spend on food, etc.