Your comments would surely be considered in the next contest, too. We will try to make the conditions more flexible to attract the interest of more players.
Anything else you might want to suggest? We're open to ideas and we always want to make our contests even better!
I think his suggestion is more than enough (lower min bet + allow participants to pick any slot game as they wish).
If I have to add something, since you have bet ID then just let player to submit the bet ID so it will be easier for you to verify the bet compared to screenshot and/or replay.
Just in case all providers are open for the contest while replay feature is not available in all providers then betID is more than enough and it can be also useful when participants are missed to take the screenshot at the right time.