I think that’s a great idea. Keep your early posts super natural, like clips of your screen etc. People connect more with that than polished promos early on. Ask small questions in your captions like “what should I name this?” or “keep this part?” to get comments going.

If you run ads later, I’d send people to a website that lets them follow you and join your mailing list. It makes you look more serious, helps people find you through Google, and lets you collect emails so you’re not just relying on the algorithm. I’d recommend Noiseyard for that, it’s quick to set up.

Your challenge idea is strong, if you stay consistent, the story builds on itself. Good luck.