

Streamers will not give you good user feedback. They are not playing the game for themselves, they are playing for an audience.
It is very good that you think about validating your expections early in the process. That way you still have time to change the direction of your game if you need to. I think the best way would be to release the demo to a smaller audience, like itch.io.
Anyway, good luck with your game.
Vibe coders exist to make sure that real coders never run out of work.
They have the same relationship like motor bike enthusiasts and emergency room doctors.