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Smaller streamers could give a chance, which is why I recommended them, even if they only have a few hundred watching that is still a few hundred that now know the game.
My game is just a visual novel, so I just need to know if the story is interesting, which I'm pretty sure it is and, due to it have a fair amount of choices, I know it is interactable enough to keep interest in it.
For your game, you'd have to compare it to similar games and see if yours can create the same "fun" feeling that other games feel, basically, just see if the concept both keeps attention and can evolve. Evolving is usually the big important part, if the concept can grow and change to different and new gameplay, then it is often fun, or at least interesting.
You will definitely need more than one tester, as one person's concept of fun can vary, people say strangers give the best advice as friends and family might not want to say anything bad about the game.