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Thank you

Found a way to change it on android,   

1. Download Z Archiver

2. Go to storage folder

3. Go to emulated folder

4. go to folder called zero

5. Go to Android folder

6. Go to data folder

7. Swipe down to folder called wolf.complex

8. Go into wolf.complex folder and then into files folder

9. Tap the plus sign in the bottom right

10. Make a folder called wolfcomplex/game/custom_background.png

11. Pick image you want cut it from the downloads folder and bring it into wolf.complex

12. Rename it custom_background.png

13. Paste it into game folder it will give you a prompt tap rename then delete custom_background.png folder

14. Rename the image back to custom_background.png

15. Cut the game folder out of the folder wolfcomplex

16. Paste it into files folder

17. Delete the now empty folder called wolfcomplex

18. Hurray the image in the android version of the ame is changed 

19. If you want to change the image again you have to go through all these steps again or it gets upset for some reason 

20. Sorry for the many steps hope this helps 

Just in case i assume you might not have seen it but i commented a eay to change the phone background on android version of game