I don't remember how exactly I was introduced to incremental games. There were two instances in my life which could have been my first introduction to them. The first was Tap Titans on my iPad. The second was the discovery of websites dedicated to hosting Flash games through one of my cousins playing an incremental-adjacent game on one of those sites. I remember the first happening when I was in 1st grade, and I forgot when the second occurred.
Incrementals and games that took heavy influence from them were the first games that I really got attached to. I had played incremental games on many platforms. At first, I played them primarily on Flash games sites such as Armor Games and Kongregate. I had also played a lot of incremental games on my phone, although most of these games were filled with advertisements and microtransactions. For a time, I played some games on Roblox which were very incremental-adjacent. Most of the games I played back then I now consider to be mechanically (and narratively) shallow.
I consider my proper introduction to incremental games as a genre to have happened near the beginning of the COVID-19 pandemics. I was searching for Swarm Simulator since I was acquainted with ScaryBee's version, and found myself surprised that there was a web version. And I also found myself surprised that there was apparently a subreddit dedicated to these sorts of game. It was from there that I became properly acquainted with the incremental genre, its community*, and the diversity of the genre.
*I have never actually interacted with users on the subreddit. However, I joined the Discord server during the Reddit API changes strike and was active there.