Kinda mid. I don't hate the idea, but it was a little stale. Not that I had time to get bored though, shortly after getting 10 "three" I had some crazy performance issues, would not pass 2 fps, and UI became unresponsive. All on a mid-end machine, too. Additionally, while I appreciate the fullscreen, there was no pause menu (that I could find) to close the game, so I was forced to win+d to even get out of the now near-unresponsive app.
Like I said, game idea isnt awful or anything, but the app has some serious issues.