Reposting the same work to bump it up on announcement feeds isn't just annoying, it's not a good way to put your pieces out for growth.
It shows the same general audience the same work you've already put up in the same places they will have seen it last time.
There is a reason itch has posting and update functions: so anyone who is interested can see whatever new stuff you've got cooking by following you. Reposting will make you look suspect to non followers who keep seeing the same stuff crop up AND punish your followers by giving them repeat alerts on their feed.
If you want the demo to be seen again every week, maybe drop an update post every week. Communicate with us: don't bash us over the head with the same content.
Thank you for reading. Much love.