I know there aren't too terribly many differences so far between the versions of this game, and that the first one was only out for a very short time, but there are still some differences. Could we have an archive of previous versions?

I did a run of the first version of the game (maybe the first and only one?):

I did runs on all versions, the difference in them wasn't anything major, just a few bug fixes that didn't affect the runs, or shouldn't have if you actually worked to optimize your run, and they made the boss head hitbox more accurate, something that would only affect the time by milliseconds. There hasn't been any changes that really change the speedrun.

I doubt there will be a version to come out that will make the run slower. If there is we’ll maybe make sub categories for the different versions. As of right now, all versions are good to run on