I'm considering holding a competition! 

I would give a small monetary prize to the first few people who can get me a full gameplay video of themselves completing my game.

So my question is, is this allowed?  I'm unsure if this breaks any rules on itch, and if it does obviously I won't do it.

Thanks in advance friends!  :)

Listen, if I can post a link to literal insect cum inflation rape hentai here on these forums without any repercussions, I'd think holding a small personal competition would also be allowed...

Besides, I don't see anything against it within the community rules, so I think you're good.
https://itch.io/docs/general/community-rules