POPGOES Arcade in POPGOES

https://www.youtube.com/watch?v=SYCEQx5Cxsc
My first gameplay video here.

i installed the game today and idk how can i beat corrupt chica shes too strong i dont have any items how can i get some?
I found several bugs. First of all, when you restart the game and beat a boss, you cannot regain the key--the chest is already opened. To add, you cannot regain the coins in the overworld.
If you spare blackrabbit the first time, you can't get the attack ending, PLEASE FIX! I CANT GET KEY AGAIN


This area and diaglouge feels familiar...
Can someone help with this key?
I found the key in the wall of the castle, however, I have no clue what to do with it now. I've searched around constantly, to no avail. Note, I am at the end of the game before the Freddy fight. does this have any affect?