Today's update:
Sorry it's not in English; but basically, Juu and I had a brainstorming session about the best way for the cat to get his item from the main box. She come up with button choices at the main box for restocking item, and I think the best way for showing the item on the cat's possession.
Although putting individual item on the box is the most visually appealing, I didn't think I would have time to finish it (also, looks like it would be quite a pain to animate and programming them). So I thought to use dialogue box to show what the cat has in his inventory at the moment.
And this is the design for the "stage". The orange way is the indicator where the cat would move, green for the passengers, and yellow for the passenger placement. I'm not quite satisfied with the design though ... so perhaps it would undergo some changes. (Also I need to change the "drive safely" into "check your belongings" since it's more fitting that way. :p)