I actually think this a pretty fun game lol but.
1. Be able to move 4 boxes with like a dolly
2. Anti rat stuff or mouse traps.
3. People can get rabbies from rats? (lol)
4. Press E to open up boxes.
5. Extra counter space
6. Bigger opening for entrance to the dish area.
7. Advertising - some way so only a few people come into your store at the beginning then if you want more to come in you have to do something to get more people into your store. (I.E. hand out flyers, call the newspaper or something)
8. Something like those drink dispensers so you can fill it up with like 50 hamburgers press E on it and it spits out a hamburger patty or buns or lettuce etc.
9. Drinks and fries ?
10. Disco ball in the back.
Just some suggestions. :D