I think this is what an idle game should be. The achievements are reasonable, and only take an hour or two of play/watch/run-in-the-background time to collect.
A lot of idle games are a horrible combination of boring and addictive, and just sit there wasting your processing power for hours on end while you strive to collect 67 octillion dollars, or cookies, or whatever... To get your next building/achievement/upgrade/etc...
As it seems you are continually updating the game, like a lot of other idle-game people, it would seem that the challenge would lie in keeping your game interesting/stimulating, and not following the trend of making a "game" that eventually just sits for 5 hours before you can actually do anything...