The workspace is empty - there are no game files here. It seems like the game files from a previous version aren't present in this workspace.

Also, I don't see any uploaded GIF files. Could you:

1. **Re-upload the GIF files** you want to use for the monsters
2. **Share the game code** or let me know which version had the monsters so I can recreate it

Without the existing game code and the GIF files, I can't make the swap. Please re-attach them and I'll get it done.