Then how the DLCs are being downloaded might be causing the problem. What order are you doing them in?
I download the 3rd step, open it to check the message it comes with, do the same with end step/marriage step, and then re-download the base game ^^
Can you see if the game runs without the DLCs? If it does, the issue might be that the game has just become too hard for your device to run with additional content added.
I have checked, and it does not work without the dlcs either😔 it does the same thing, just without the added message-
Then I'm afraid the game might not work on your device. It would be best to contact Itch for a refund. I'm sorry.