Glad you enjoyed our game!
The game actually only has one level, it was to fit with "Failure is Progress" - as even though you make customers happy, you have to either trash the restaurant by losing all the furniture, or feed your human customers to the monsters. As the artist, I wasn't involved in play testing because I was so busy (and run a mac xD) but I did hear the playtime length could be quite variable depending on the monster spawn rate.
If you had made it to the end (by losing all the furniture), I believe the end screen would have given you a score based on how many happy customers you served - we had planned to have a second fail state you could reach by making too many customers angry but I believe that was scrapped (along with various bonuses like sound options and key mapping!)
Irregardless or the lumps and bumps, glad you enjoyed all of our work over this long weekend, thanks for commenting!