Go to Ember Islands, on the left. Select the "Code Entry" option on the "Game Secrets" menu, then enter one of the following codes to activate the corresponding cheat function:

All chapters

Enter "52993833" as a code to unlock all chapters.

All shop items available

Enter "34737253" as a code to unlock all shop items.

All concept art

Enter "27858343" as a code to unlock all concept art.

Maximum coins

Enter "66639224" as a code.