Word of advice: when playing the Cake Cat mission, get the Rasta Coins and Peace & Love first.
The key to the chest is in the pool - IF YOU UNLOCK THE CHEST AND LEAVE THE STORE BEFORE PURCHASING PET FOOD, THE KEY DOES NOT RESPAWN - you cannot complete the game, even after respawning, restarting, and clearing history/cache/etc.
There were some other bugs, too, such as falling through walls, but the game is cute and enjoyable if you are careful with it.
RIP Francisco MunguĂa Villalta; some games were janky, but you brought joy to both your community and ours through your art and humor. You will be missed. <3