“I did no paid promotion on the game, the only thing were two posts on Reddit on /r/incremental_games”
One of the best success stories of a solo game dev that I came across is of Matias Colotto an indie game dev, who developed the Idle Incremental game “Magic Research”.

Screenshot of Magic Research Game
[Available on Steam, App Store & Google Play]
The premium game, rated at 4.9 on GP, is a UI-based idle game where you are the headmaster of a newly created institution of Magic. The game contains various systems including exploration and fighting battles.
The game features over 40 hours of gameplay with 6 dozen storylines to be explored.
But how did Maticolotto bring this game to reality? Let’s take a look at the interaction I had with the developer: