Hi Chiaki! First, thank you for playing and streaming my game ;\\\; I'll go watch the video asap!
As for the errors, you're probably running an older version of the game, I updated it to fix those specific errors.
If you download it you can use the same save files before the 21st medal on it (if you need help ask me, I'm here for this) and they should work fine, otherwise I can give you my save for the bonus room! Let me know!