Catapult has a great UI with simple graphics and a really smooth feel. I played on my Torch (also compatible with 83xx, Curve 85xx, 89xx, 9000, 93xx, 91xx, 95xx, 96xx, 9670, 97xx,and 9800) for almost a half hour, and the game never lagged or felt sluggish. I hope the future brings updates like maybe more levels or different sized rocks or something, just to mix it up. For now though, I feel Catapult is worth the $.99 price tag. My high score (so far!) is 58,487. If you beat me, post your score in the comments!
For more information and to purchase Catapult in the CrackBerry store