It seems like you dropped every file into itchio rather than making the .zip file of the .html version.

Take all the files that godot creates when you export to html and zip it (windows has a tool by right-click -> sent to -> zip file).

After the zip file is made you can upload it on itchio with no problem.

Thanks! Yeah having the CCTV's not turn on until after you'd read the email was on my list of todo's, also wanted to be able to change the difficulty and have less screens. But what can I say work got in the way ;D