Seems like you won't be able to receive a refund. I hope you enjoyed donating to the site owner. :/
That's not what he says in the first post.
What is your limits for a single bet, what will be happened with my bet if it's amount is beyond the limits?
— Min bet is 0.01, max bet is 0.3, bets that are not withtin this limits will be returned to senders with miners fee deducted
If he wants to run a long-term business instead of scamming a few people for <$5, it is in his interest to honour his word.
I believe the website is still in development and subject to glitches. I reported 2 of them here: transaction went into "Processing..." instead of closing after 60s (you can check the time logs, it is a bet I should have won) and bet below minimum is not being returned (you can check the blockchain) If the owner accepts to refund, he will prove beyond doubt that his website is not a scam. If not, I lost $10 and life goes on