I have a problem, after killing the wasp I entered the castle and accidentally dropped an inventory item and when I wanted to retrieve it, the game went full screen and everything is black. The game shows the interface but a second passes and it goes black and closes. I don't know what to do help me!

Hey there! Thank you for the report!
There are two things you can try:

1. Send me the error log so I can hunt down the bug

2. Delete/hide your save files

There are instructions for how to do both in the following video.