I found the game entertaining but felt like a was not consistent in the interface. The worst part though is every ten or so pulls on the catilput an ad wold pop up. The first few were just to close and start playing again, but afterwards they had ads that were video based and caused you to have to wait until a countdown timer got to zero. I found that even when it made it to zero, the ad continued for several more seconds, even when you were opting out. One time I could not get ad to stop and exited the game to start play again.
TekManiac about Cat-A-Pult: Endless stacking of 8-bit kittens