I love how atmospheric and chill this game is. As previous commenters said there's a tiny bump where you start waiting for a few upgrades but I play quite a few Idle games and said bump isn't too uncommong to be honest. An idea would be to add another mechanic that keeps the user occupied in those moments. There's a few incremental games out there that are open-source maybe look at these for some inspiration for working out your formulas and whatnot, one very involved one that's one of my favourites would be https://github.com/pmotschmann/Evolve