As an idle game, it's pretty simple. It does what it says on the tin, but doesn't bring much in the way of upgrades or variation.
The big hit against it, though, is that you don't make an idle game without a mute button. That's just idle-game-101. I can't have this running indefinitely in the background if I'm forced to listen to the same musical loop over and over again. It doesn't matter how smooth it is, after ten minutes, it's frakking tedious.