After a long session, I finally got a good Any% run in, at 3min 58sec, but in my victory bliss I messed up what to press to show the modlist. So I went for Exit, thinking it'd take me to main menu, but it exited the game entirely XD So I just restarted immediately to show it.

It's not a perfect run by any stretch of the imagination, but I wanted to ask before uploading if this is considered a breach of the rules? It was an honest mistake.

It is not such a problem, but you should show mods during the session. Just press ESC and click on "Mods". I think Yolksyb will verify it if you didn't play sussy. You can find other's runs without showing mods, like Hitless former WR, but it is still a rule which everybody mustn't break. If you do that many times in a row it will be a reason to reject the run.

It's fine as long as the run isn't any suspicious in other ways. Having a recording of the whole session as an unlisted video could help too in these situations.

Awesome! :) Thanks for replying so fast to this. There is a VOD on my youtube that is around 5 hours or so from the whole stream.

I'll probably try to get a better time in the future, and will certainly remember to do it the right way then :)

Note - the linked video in this post will be reuploaded as I messed up the sound quality (Game audio too high). The official submission video will be online there soon.