The item window would be less messy if the items would be arranged in columns and lines, and implemented scroll bars to move down only.
Items should be able to be stackable when right click in the window items, (in clear part of the window) it should pop up an options menu, with stack option.
The Sprouts, leaves, etc (items with same graphism) should have different colors (brown, green, light green, dark green, etc) so we can differentiate them.
Also "click Radius" should be bigger, cause sometimes only in a correct spot we can pick an item.
When mining and tunneling the camera should not acompan the mining moovment. Sometimes we see watter (lol) when the camera passes the wall of the mine itself.