It looks simple but actually needs quite a bit of thinking and management if you want to progress far.
It can be played solo but it is more fun and bit easier with at least one friend. Cooking and delivering food alone can be a challenge. It is probably better to set up kitchen and tables in the same room if playing solo.
You can do many different tactics and cook different foods. Do it all by hand, automate it all or anything in between. Many paths to choose to keep the game interesting for a long time.
At the time of purchase it was considerably cheaper in CDKeys (about €7 vs €17 from steam) so a lot of money saved too :)