The gears when the game is loading shouldn't mesh. They have the same number of teeth, turn at the same radial speed, and one is half as small as the other. To be accurate, the smaller one should have half the number of teeth and should turn at double the radial speed of the larger one.
It would be nice to have up to jump and to be able to use the drill as a melee weapon. It's annoying having something that will drill through dirt and rock, but not sentient mushrooms.
There are so many glitches that it's not funny. My IT guys haven't fixed the lights on the unpopulated third floor (I only had 3 floors and only added the third because I needed 10 offices on screen), the Janitors I had would ride up and down the elevators doing absolutely nothing else, other than run back and forth from the elevator to the janitorial office, my accountants weren't working (I think. The bins weren't filling up.), and my supervisors were complaining that there wasn't an elevator, even when I put one right next to them.