I love me some idle-style games, and this was quite fun! I really enjoyed it!
One thing, I wouldn't recommend using "Escape" as a hotkey for anything when making a browser game because if you're fullscreened, it just pulls you out of that and still doesn't do what you wanted. Even if you aren't fullscreened, I think it can be temperamental, so be careful with that.
In any case, very nicely done! :)