To my understanding, there's a 48 hour grace period where builds are not locked to allow for bug fixes in case you couldn't make it in time. This counts as a bug fix to us, since a couple of the team noticed the sensitivity was unreasonably high. I since looked around to make sure I wasn't going mad, and there's a known difference in the mouse sensitivity between builds for WebGL and other platforms which we weren't aware of. I don't think we've done anything wrong here as we're not adding features any more. For instance, it would have been great to add this as an option in a settings menu, but we ran out of time. We also don't have a pause menu where such a setting would have been helpful, but again we ran out of time.
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It is, yes! On the jam homepage, there's the following text under the "Submitting" header:
Game files are not locked for the first 48 hours of the rating period. This is for fixing bugs and adding alternative platform support. Don't use this feature to otherwise update your game. After the rating period is over, if you wish to continue working on your game, please keep the original jam version as an alternative download.
It's essentially done on a honour system, which is very permissive, but hopefully people understand that there's nothing to be gained from winning the jam through disingenuous means. They also reinforced this point in the deadline announcement on their Discord server. If you've got some bugs you want to iron out, you still have time!