Also the rock inventory doesn't use all available space, so it has to scroll. And picking up a rock can scroll it, so good luck finding where that new rock went.
There's also terrible delays. I don't mean the delays in gameplay (which were intentional, but blech), I mean delays between when an object upgrades and when its new image appears. Or the delay between when the buttons APPEAR to be active again, and when they're actually active again. Very frustrating to click when it seems available, only for nothing to happen.