Definitely not just you, lots of people, we didn't spend enough time on the user experience and teaching each mechanic. Lesson learnt though, thanks for the feedback! Will definitely check out your game but I can't guarantee a rating since Paku is the one who submitted our game (I can't vote)
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If I remember correctly, the original submitter can add more users as "admins" to their project which then can be ticked as "collaborators" to be displayed as additional creators of the submission and to be granted the permission to vote.
You'll find the option under the Admins section (hidden under More) of your project's Edit Project page (you can find the button to enter the page beneath your specific project on the Projects section of your dashboard) but since only the original creator can access the edit page, you'll have to ask paku to add you. That's how I got to vote on all these amazing submissions. :D
Good luck!