I agree a tutorial would have been a big help but typically we ran out of time! In hindsight we definitely should have made a web build but we were worried performance might be a issue. It seems web games get played a lot more though so next time for sure!
For the reference, if a web build works OK in your tests, I don't think anyone would blame you for uploading one even past the deadline, as long as it's the same code as the native builds.
