Not bad. simple deposit mechanism, fast play, decent (if a little tight) payouts.
Are there better payouts for video poker? We can definitely reconsider the payout schedule. At 5x bet, the game should be over 99.5% return.
We're also working a double down feature that some Vegas-style versions of video poker have. Look for it in the future:)
The game you have set up - I have played it a fair bit when the excellent (though less professionally interfaced) competitor play.luckco.in has been down - is a "9-5 jacks or better" machine, which has a 98,4% return with perfect play (I calculated it yesterday, I think). The "full-pay" structure you refer to, with 99,54% return assuming perfect play and a fixed 799:1 (4000-credit) RF jackpot payout, pays
30 credits for a flush on a 5x bet rather than 25.
Nonetheless, your game is mathematically similar to SatoshiDICE and much better than most video poker machines I've seen outside of Las Vegas. I give it a reasonable thumbs up, and a much bigger thumbs up if you upgrade it to a full-pay machine as described above ("9-6 jacks or better").
I have another opinion regarding vigorish and advantage play. If you offered some kind of progressive jackpot, say, by adding 1% of each wager into this jackpot pool, combined with a "9-6 JoB" payout structure as described above, the theoretical payout would rise to 100,54% (unless I'm mathematically impaired), but I think the House would still turn a profit, because few players play perfectly, thus donating money back to the House. Why don't real-world casinos offer more ultra-loose loss-leading games like this, I wonder? In Australia and New Zealand the casinos are known
to give away free money in prize draws, sometimes $10k or more! as loss leaders, the only caveat being you actually have to be present in the casino at the prize draw when it takes place.