I decided to get the rate to max just for fun, but aside from that, this game is OK, and not much else in terms of wanting to kill time.
As far as an Idle game goes, it gives better bursts of dopamine that's constant unlike Cookie Clicker which gradually grinds to a halt. The idea of being able to max out an idling generator for a final strong boost is a pretty good idea and feels very satisfying compared to forever levelling them.
The game looks nice for the most part and has a narrative, but the TLDR without going into it is that I wasn't captivated. Es is a little ranty, the progression up till then is kinda weird and in-your-face in terms of trying to be deep, and things that happen to Es seem to be something entirely unexplored. Like the whole game is just a series of ideas. Using real books and quoting them was an interesting bit but otherwise there's not much that I took away from this game and felt it was rather on-the-nose, especially with the postgame (Es has a habit of talking like the usual trailing-off anime girl). That said, I didn't bother with the IAPs, so I have no clue what's added but I don't feel interested in looking it up. Apparently there's a sequel...? Whatever.
Anyway, if you want some time to kill and some text to read, you could choose something way worse. I got through this in like a week, and I definitely didn't hate it.