I can't vote in a jam https://itch.io/jam/cyberpunk-jam-2019 even though I was a co-creator of https://leexx.itch.io/organpunk

Would be cool if I could

This is a jam setting that the host has configured. They have it set to allow voting from the submitter only. We give this option to prevent large teams having more voting power. You can reach out to them to ask.

Thanks for clarifying!