Idle games have always been fundamentally bare bones. Cookie Clicker, said to be the game that laid the groundwork for the whole genre, is fundamentally simple. Unless you enjoy the farming or the stock market mini game, the only real option you have is clicking on more cookies and waiting for temporary boosts that can increase your production 10,000 fold.
Why is Cookie Clicker fun then...
To me personally, it's main driving point is the extensive hidden lore funny enough. It may seem simple at first, hiring more grannies to cook cookies. Soon however, you find yourself within the cookie multiverse, feeding your own cookie dragon.
All in all...
Idle games fundamentally lack the "gameplay" element. To supplement this, many developers have introduced other sources of appeal, such as humor, lore, story, or simply the raw dopamine of seeing a large number. Even though the writing is not something to write home about, I still would highly recommend that you focus on Storytelling as your main "hook". If you continue to work on this project, I could see some potential in a more witty light hearted adventure that could poke fun at tropes and its source inspiration. Overall, good job and good luck.