The artwork is very charming and the gameplay loop is pretty fun!
The low cost of the upgrades does make the game a bit too easy in my opinion and the spit roaster upgrade is a bit pointless as putting meat on the upper floors takes more time than just cooking two pieces of meat and throwing one at a carnivore the second he shows up after purchasing some of the other upgrades, which then makes buying all the upgrades a bit too easy as this strategy makes it possible to get about 15 points per day.
P.S. The ending is great!