Overall I think this game does what it sets out to do and does it fairly well!
In my time playing the game (I have about 200 hours in it or so), I only ran into 2 bugs. One was pretty devastating to me, not gonna lie, and the other was minor but will annoy long time players.
The les annoying bug is that when the golden question mark button spawns behind the text on the screen, or behind the cookie itself, it can't be clicked. This feels like an easy bug to fix, just have areas of the screen that are not able to spawn the golden question mark button, or make it to the button can appear over those UI elements.
The second one I experienced today when my power went out (we just had a major tornado rip through our town), and when my power inevitably went out, when I launched back into the game my entire cookie prestige percentage had been reset to 0%. This means all those hours of grinding was reset back to 0. I don't know if that multipler only persists across a single session, or if there was a bug that I ran into, or that it was reset as part of an update to the game, or if my Steam cloud sync somehow caused it, but regardless it happened and I was quite devastated. I am currently #1 on the clicks and prestige leaderboard, and #2 on the cookie leaderboard. I'm hoping this didn't reset that progress as well. It doesn't seem to have, but I have a lot of grinding ahead of me to get back to where I was.
I did just run int another bug, which was that the golden cookie found text can sometimes run into the background and be behind the right box meant for UI elements.
Anyway, great game, overall works really well, but maybe some time investigating those issues would bring the polish up to 1.0 standards.