How so? I've yet to see any significant bugs in the game or reported by other players. Maybe it's your browser?
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That sounds like an issue with your internet connection or browser. When the game switches stages it has to grab the file for the next level from the itch servers, so maybe your connection is being cut or some security setting is kicking in and preventing communication with the server? If you try with a different browser or try using the windows build it should work fine. Sorry about that, it's the first time I've heard of someone having that issue with this implementation of stage loading.