Hi to all the other solo devs out there! I've been building http://moonman.io/ mostly by myself for 4 years now, writing all the code (roughly 100k lines of c++) as well as creating all the earlier art and design. Earlier this year I was lucky to be crowdfunded enough to hire an artist and continue working on the game.

On projects that span years you find that you're not actually working alone, you're collaborating with your younger self. A younger self who is more naive, more optimistic, sloppier, and who leaves funny comments for you to stumble across years later.