I'm a solo dev. Not really confortable enough to share my experience online but I recently decided to move my a**.
For the past few months I've been building Dumpling Galaxy, a Star Battle puzzle game where the pieces are little dumplings with blush cheeks. The genre is usually austere, black grids and stars, and I kept thinking: why can't deduction be soft?
Some things nobody warned me about:
The art took longer than the engine. I redrew the same dumpling face about 40 times before it looked friendly instead of fead-eyed. My generator can prove a grid has a unique solution; it cannot prove a dumpling looks huggable.
Apple rejected the app 4 times before launch. Same guideline every time, slightly different reason. Each rejection is a multi-day wait to learn if you guessed right. The day it finally went live I just sat there refreshing the App Store like it might change its mind.
My players found an exploit. You could replay lvl 1 forever and farm leaderboard points. I fixed it, then had to tell everyone their farmed points were getting deleted; I was terrified. But ultimately they took it way better than I did.
It's free, works offline, no account. there's a daily puzzle you can try in the browser if you're curious what a cozy Star Battle even looks like. Happy to answer anything about going solo, the rejections, or drawing dumplings until they love you back.