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I do not see it as an effective promotion if the main idea is to get feedback from those who take the bonus.
You can try to have review bounties with some requirement and better rewards for those who are willing to do honest review.
I have not explored your casino yet, but opening your site for the 1st time through mobile browser, I have to say that it looks good enough.
Well, I decided to not participate... I think there are some forum rules against such PMs. There is a "games and rounds section" for such giveaways and a "service section" for reviews.
The site looks good, and they have some nice promotions there, but they need to think about some better marketing...